#1

o3 isn’t always right but it’s ALWAYS directionally insightful

===

Key take-away

Even a tiny weekly semaglutide shot can put as many—or more—plastic particles directly into your body as the thousands you save by eating less. The balance hinges on three very uncertain numbers:

Parameter Best-documented range (2024-25 literature) What it means for a typical 0.5 mL semaglutide injection once a week
Micro- & nanoplastics released by one plastic syringe (mostly PDMS debris + silicone-oil droplets) “Thousands of micro- and ≈10⁶ nanoplastic particles per mL” from a 1 mL syringe (考研) • ≈1 k particles ≥10 µm / mL in insulin syringes rinsed with water (PMC) 0.5 mL shot → ~500 – 5 000 microplastics + 0.5–5 million nanoplastics / week → 26 k – 260 k MPs + 26–260 million NPs per year
Microplastics in parenteral solutions (IV bags, injections) NaCl & glucose injections averaged 895 MP particles / kg solution (考研); IV saline bags ≈7 500 MP / 250 mL (www.ndtv.com) Confirms that particle counts vary by 2–3 orders of magnitude depending on device & formulation
Dietary microplastic intake in U.S. adults 39 k – 52 k MPs / year from food & drink (not counting inhalation) (PMC) A 25–30 % drop in food volume (typical with GLP-1 therapy) saves ≈10 k–15 k MPs / year

1. Where the particles in your pen come from

  1. Glass cartridge, plastic shell – Wegovy/Ozempic pens contain a Type I glass cartridge, but the plunger and needle hub slide against chlorobutyl rubber + a thin film of silicone oil; the outer body is polypropylene, POM, PC, and ABS (European Medicines Agency (EMA)).
  2. Silicone-oil micro-droplets – Lubricating oil is the dominant sub-visible contaminant in pre-filled syringes, with counts around 10³ droplets ≥10 µm per mL in insulin syringes (PMC).
  3. PDMS wear debris & nanoplastics – High-resolution Raman/SEM work shows “thousands of microplastics and millions of nanoplastics” liberated when the plunger of a 1 mL plastic syringe is pushed once (考研).

Because your semaglutide volume is only ~0.5 mL, these figures are cut in half—but you still inject the particles directly past skin barriers (subcutaneous tissue can trap many of the larger ones; nanoplastics may enter circulation).

2. How that compares with the plastic you stop eating

Semaglutide users typically cut daily energy intake by ≈400–600 kcal (~25 – 30 %). If microplastic exposure scales roughly with grams of food, that trims 10 k–15 k MPs per year—about a quarter of the “average American” dietary burden (PMC).

Even the lowest syringe estimate (≈500 MPs per shot) erases that saving; the higher end (≈5 000 MPs) exceeds it by an order of magnitude. Nanoplastic counts dwarf both figures.

3. Health significance (still largely unknown)

  • Route matters. Ingested MPs face gut barriers and are mostly excreted; injected particles bypass first-pass defenses and linger in tissue or lymph.
  • Particle chemistry. Silicone oil (PDMS) is considered low-toxicity but can provoke immune or granuloma reactions in rare cases; harder plastics (PP, PC) may carry additives or adsorbed chemicals.
  • Dose–response gaps. Toxicology data for chronic, low-dose injected microplastics are virtually absent—regulators focus on visible particles ≥10 µm, not the nano-scale debris highlighted in new studies.

4. What you can do to tilt the balance

Leverage point Practical steps Expected impact
Lower the injection particle count • Use the multi-dose FlexTouch pen (glass barrel) rather than single-dose all-plastic autoinjectors when possible.
• Prime and discard the first droplet to flush large silicone droplets.
• Attach the needle only when you are ready to inject; remove immediately after.
• Store pens upright (plunger at top) to let droplets settle away from the needle.		 Small — may cut large-droplet load several-fold, unknown effect on nanoplastics.
Choose silicone-oil-free or glass syringes (if you ever draw from a vial) Specialty baked-on silicone or COC (cyclic-olefin copolymer) syringes shed far fewer droplets; all-glass Luer-lock syringes with stainless plungers eliminate PDMS entirely. Moderate — published counts drop by >90 % compared with standard plastic syringes.
Push dietary exposure even lower • Skip bottled water (up to 370 k nanoplastics/L).
• Favor whole produce over processed foods in plastic film.
• Brew coffee/tea in glass or metal brewers (paper filters).
• Replace plastic cutting boards & utensils with wood or steel.		 Can shave tens of thousands of MPs per year—enough to over-compensate for your injections.

Bottom line

If your weekly semaglutide dose uses a standard lubricated pen, you’re probably adding tens of thousands of micro- and hundreds of millions of nanoplastic particles per year by injection—roughly the same order of magnitude you might “save” by eating less.

Because the injected particles enter through a less-studied route, the risk trade-off is uncertain. Until better data arrive, the lowest-regret strategy is to:

  1. Minimize syringe shedding (glass or silicone-free devices, discard priming droplets), and
  2. Push food- and water-borne microplastics even lower—that leverage is larger and already well documented.
1 Like
#2

Omg I really thought ozempic was the best way to reduce MP load. Now it looks WAY more complicated…

[tbf tho, the below calculation vastly underestimates ultrafine microplastics/nanoplastics in food…]

Short answer — “almost” is fair, and in many realistic scenarios the balance tips so the weekly Ozempic® shot injects more micro- & nanoplastic particles than you spare by eating less.
But there’s a very wide uncertainty band on both sides of the comparison, so think of the numbers below as order-of-magnitude guides, not precise tallies.

1 How many particles ride in with a once-weekly Ozempic® dose?

Parameter Best evidence & reasoning Mid-range value
What material is inside the pen? Glass cartridge in a polypropylene/PC/ABS pen body; plunger and barrel are silicone-lubricated — same lubrication chemistry as insulin or intravitreal syringes. (European Medicines Agency (EMA)) n/a
Visible (>10 µm) particles shed per mL Average 1 179 particles /mL found when water was flushed through standard insulin syringes (silicone-oiled plastic barrels). (PMC) ~1 000 /mL
Micro- plus nanoplastic load per mL A 2024 Raman/FTIR study on 1 mL syringes estimated “thousands of microplastics and millions of nanoplastics of PDMS for every single push.” (ScienceDirect) “thousands + ≈10^6 nano”
Ozempic® dose volume 0.25 mg → 0.19 mL 0.5 mg → 0.37 mL 1 mg → 0.75 mL (drug is 1.34 mg/mL) 0.2–0.8 mL
Particles per shot (≥10 µm only) 1 000 × 0.2–0.8 mL → ~200–800 microplastics ≈500
Micro- & nano particles per shot “thousands” × 0.2–0.8 mL → ≈2 000–8 000 micro + ≈0.2–0.8 million nano ≈5 000 micro + 0.5 M nano
Per year (52 shots) ≈10 k–40 k (≥10 µm) or ≈1 × 10^5 micro + 3–40 M nano ≈26 k micro

Take-home: even the conservative ≥10 µm count climbs into tens of thousands of particles per year, and nanoplastic numbers add another two orders of magnitude.

2 How many particles do you avoid by eating less?

A widely-cited diet survey put baseline dietary intake at 39 000 – 52 000 microplastics / year for U.S. adults. (HealthDay)

Semaglutide users typically reduce calorie intake ~25 %. If microplastic exposure scales roughly with food mass, that trims ≈10 000 – 15 000 particles / year.

3 Head-to-head

Microplastics ≥10 µm Nanoplastics (<1 µm)*
Injected (weekly Ozempic®) ~10 k – 40 k / yr ≈1 × 10^7 – 4 × 10^7 / yr
Saved by 25 % less food ~10 k – 15 k / yr (not well quantified)
Net balance Likely positive (you inject as many or more than you spare) Overwhelmingly positive—nano-load is dominated by the injection

*Nanoplastics from food are still poorly quantified; bottled-water studies suggest tens of millions per year, so the nano balance could swing either way.

4 Uncertainties & caveats

  • Device-to-device spread: baked-on or cross-linked silicone glass cartridges shed fewer droplets than cheap plastic syringes, but the only published counts still show ≥10^3 particles/mL.
  • Particle size distribution: Dietary estimates usually ignore <10 µm particles; syringe studies count them. That alone biases the comparison in favour of “food looks cleaner.”
  • Route matters: Ingested particles face gut barriers and most pass through; injected ones bypass first-pass defences and lodge in subcutaneous tissue or lymph. Toxicology data at these doses are almost non-existent.
  • Behavioural variance: If you also swap bottled water for tap, you can cut dietary intake far more (one study found up to a 90 % drop). The injection then becomes a smaller slice of your total exposure pie.

5 Can you tip the trade-off back in your favour?

  1. Use every-other-day priming: Prime until a drop forms, discard that drop, then dial your dose. That flushes the largest silicone droplets.
  2. Store pens needle-up: lets droplets settle at the plunger end.
  3. Ask for silicone-oil-reduced syringes if you ever draw semaglutide from a vial (glass barrels with baked-on silicone or COP syringes).
  4. Double-down on food & water hygiene: filtered tap water, glass/steel cook-ware, minimal plastic packaging—these steps can save tens of thousands of particles per year, easily offsetting what the pen adds.

Verdict

Given current data, the statement that “a weekly Ozempic® pen delivers almost as many microplastics as the ones you save by eating less” is broadly accurate, and may even understate the nano-scale burden. The exact ratio hinges on your dose size, the specific pen lot, and how much your food habits change, but the two quantities are indeed in the same ballpark for visible microplastics—and the injection likely dominates your nano-plastic exposure unless you were drinking a lot of bottled water beforehand.

1 Like
#3

Hah I never even considered this. My concern with a glass syringe is if there are glass particulates inside the syringe that go into your body, which arguably could be worse than microplastics.

The health calculation of GLP1 agonists isn’t just microplastics, they have a range of health benefits above just eating less.

Injection is currently superior to any orally bioavailable version for convenience and health effects.

Injection is once a week. Oral forms I hear you need to wait 30 minutes after taking before consuming anything, which might sound fine but you will likely soon get sick of doing this daily.

1 Like
#4

Low-Shedding Glass Syringes for Semaglutide Injections

Why Use Glass? (Reducing Microplastics & Silicone Oil)

Standard disposable syringes are plastic and typically lubricated with liquid silicone oil (polydimethylsiloxane, PDMS). During an injection, these can shed microscopic particles: one study estimates that “thousands of microplastics and millions of nanoplastics” (mostly silicone oil droplets) may be injected from a single 1 mL plastic syringe . Silicone oil droplets and plastic particulates are undesirable for chronic injections, as they may trigger inflammation or protein aggregation in sensitive formulations . Glass syringes eliminate most of these contaminants – high-quality Type-I borosilicate glass is inert and doesn’t shed plastic, and a well-designed glass barrel can operate with little or no free silicone lubricant. For this reason, glass syringes are preferred in many pharmaceutical and laboratory applications where purity is critical.

Moreover, ultra-fine needles (30–31G) tend to have very low injection force requirements, so a smooth plunger motion is needed. Manufacturers usually achieve this with silicone oil on disposable syringes, but alternatives like baked-on silicone or silicone-free coatings can provide lubrication with far fewer free particles. For example, baked-on silicone is a curing process that leaves a thin silicone layer bound to the glass – this yields much lower particle shedding than wet silicone oil . (However, even baked-on silicone can release some subvisible silicone droplets in the 1–10 μm range .) The ideal solution is a silicone-free syringe, which uses no lubricant at all – either by using an ultra-smooth glass piston or a special coated plunger. Such designs virtually eliminate injected microplastics; for instance, a silicone-free polymer syringe was shown to have the lowest sub-1µm particle levels in tests . Below we outline syringe options that meet the criteria (0.25–1 mL volume, fine-needle compatible, minimal shedding) and where to find them.

Reusable Glass Barrel Syringes (0.25–1 mL)

Reusable all-glass syringes (10 mL size shown) with a glass slip tip (left) vs. a metal Luer-lock tip (right) . Small-volume versions (1 mL or 0.25 mL) have similar designs, offering precise dosing with minimal lubricant.

For precise low-volume dosing, traditional reusable glass syringes are a great option. These syringes have a borosilicate glass barrel and a matching glass plunger (piston) ground to a tight fit, so they form a seal without any rubber or oil lubricant. Because no plastic or silicone is scraping into the fluid, particulate shedding is essentially zero. They are made to medical/laboratory standards – for example, the Air-Tite “Truth” and Fortuna brand glass syringes use precision-machined glass components that are leak-proof and meet ANSI/ISO specifications for medical syringes . The glass is high-purity Type-I borosilicate (heat resistant and chemical resistant) , and the fit is precise enough to be liquid-tight. Graduations are permanently marked and very fine; a 1 mL tuberculin glass syringe typically has 0.01 mL gradations for accurate measurement. Small 0.25 mL (250 µL) glass syringes are also available for even finer dosing – e.g. Cadence Science offers a 0.25 mL tuberculin syringe with 0.01 mL increments – though these niche sizes can be expensive. In practice, a 1 mL glass syringe can comfortably measure a 0.25 mL dose with high precision.

Luer-Lock vs. Slip Tip: Glass syringes come with either a metal Luer-lock tip or a glass Luer slip tip. The metal Luer-lock versions have a nickel-plated brass collar threaded onto the glass tip, allowing any standard needle to twist-lock securely in place . This is ideal for attaching very thin insulin-type needles (30–31 gauge) – the lock prevents the needle from popping off under pressure. The glass slip tip versions are all-glass (no metal); they hold a needle by friction. Slip tips also fit fine-gauge needles but require careful handling due to the purely glass interface. In the 1 mL size, many products are slip-tip; if a Luer-lock is preferred, look for models explicitly labeled “metal Luer lock”. For example, Air-Tite’s “Truth” 1 mL Glass Syringe comes with a metal Luer-lock tip and is described as “High quality, reusable… Nickel-plated brass Luer lock fitting” . Socorex’s Dosys 155 glass syringes in the 0.1–1 mL range also offer a Luer-lock variant (Cat. #155.0501) alongside the glass tip version . Both types will accommodate ultra-thin needles (if using slip tip, ensure the needle hub fits snugly on the glass cone).

Sterilization and Reuse: Reusable glass syringes are typically sold non-sterile (often marketed for laboratory or veterinary use ). Before human injections, they must be sterilized – they can be disassembled and autoclaved (steam sterilized) at 121 °C without damage , or boiled in water if an autoclave isn’t available. The glass and metal parts are durable and can be reused many times with proper cleaning. (If reusing for multiple doses, it’s wise to rinse and dry the syringe after each use to prevent any medication residue from drying and sticking the plunger.) Users report that a well-made glass syringe has a smooth plunger motion, though initially it may feel stiffer than a silicone-lubricated plastic syringe. Over time the motion often improves with use as the glass surfaces wear in; do not apply oil – the goal is to avoid lubricants. If absolutely needed, a tiny amount of sterile glycerin can be used on the plunger, but generally the syringe will glide adequately when wet with the injection solution.

Where to Find Them: High-quality 1 mL glass syringes are available from specialty medical/lab suppliers. Air-Tite Products, for example, offers 1 mL and 2 mL Fortuna glass syringes (made under ISO 9001 quality standards) for about $7–$9 each . These come individually boxed with interchangeable barrels and pistons (spares can be swapped in if one piece breaks) . Socorex (a Swiss lab equipment maker) sells similar all-glass syringes in sets of 3 – their documentation touts “superior chemical and heat shock resistance… precision-machined plunger and barrel… excellent fitting and liquid tightness… autoclavable at 121 °C” . In practice, many of these syringes are the modern version of the old-style glass insulin syringes used decades ago. They are considered inert and low-shedding, since they contain no rubber (latex-free) and use no silicone oil. The main trade-off is that you must handle and sterilize them carefully. (They’re also not FDA-cleared as single-use disposables – however, the build quality is medical grade. For instance, the Truth/Fortuna syringes meet “American National Standards for Medical Materials” but are labeled for lab/vet use.) For most personal users, purchasing a few of these syringes and reusing them is a practical way to minimize microplastic exposure.

Examples (1 mL Glass Syringes):

  • Air-Tite “Truth” 1 mL Luer-Lock Glass Syringe – Borosilicate glass barrel with a ground-glass plunger and metal Luer-lock tip . No silicone oil or rubber. Reusable; sold individually. (Air-Tite Catalog GTOP3L). Compatibility: Standard Luer needles (including 30–31G) lock on securely . Availability: Air-Tite’s store (and resellers) list these around $7–$8 each (as of writing, the 1 mL was out of stock, but 2 mL is available; check for restock or similar brands).
  • Poulten & Graf (Fortuna) 1 mL Glass Syringe (Slip Tip) – Another high-quality option, virtually identical in function except with a glass slip tip (no locking collar). Also borosilicate, with interchangeable parts, made initially in Italy (new production in India) under ISO 9001 certification . These are about $8–$10 each. They require the needle to be pressed on (no thread), but fit any Luer-style needle.
  • Socorex Dosys 155 (0.1–1 mL) All-Glass Syringe – A premium laboratory syringe, sold in packs of 3. It features a glass slip tip by default (Cat. 155.0301) or metal Luer-lock tip (Cat. 155.0501) . Fully autoclavable and precise; division markings at 0.05 mL (i.e. 20 increments per mL) . Useful if you need multiple syringes or a very refined build.

Finally, note that some economy glass syringes on the market use glass barrels with plastic/rubber plungers (instead of a full glass plunger). For example, the brand “KOPPERKO” sells a 1 mL glass syringe on Amazon that has a clear plastic plunger with a rubber piston tip . These designs are still silicone-oil-free (the rubber provides the seal without added oil) and made of Type-I glass, so they are an improvement over fully plastic syringes. Users have found them adequate for injecting peptides and oils. Just be aware that with any rubber-tipped plunger, there could be minimal particles from the rubber, and the plastic plunger rod isn’t as heat-resistant (so if you plan to autoclave, check the specs). That said, such syringes are marketed as reusable and “more corrosion resistant than plastic syringes” . They often come in bulk packs (e.g. 10-pack or 100-pack) and sometimes even sterile. For instance, Vevor offers 1 mL borosilicate Luer-lock syringes with rubber pistons that come “individually sealed, clean, safe, and sterile” for lab/vet use . These can be a cost-effective single-use option if one prefers not to resterilize – you could use a new glass syringe for each injection and still avoid plastic shedding (at the expense of some rubber contact).

Low-Particulate Prefillable Syringes (Baked-On Silicone or Silicone-Free)

In the pharmaceutical industry, prefillable syringes for sensitive drugs (like biologics and ophthalmic injections) have been engineered to minimize particles. If you can obtain these or work with a compounding pharmacy, they represent the state of the art for low-shedding injectors in the 0.5–1 mL range:

  • Baked-On Siliconized Glass Syringes: Most commercial 1 mL glass syringes (e.g. those used in autoinjector pens or prefilled biologic drugs) use a baked-on silicone coating in the barrel. This provides lubrication for the plunger while drastically reducing free silicone compared to standard syringes . For example, Schott’s syriQ® and Gerresheimer’s Gx® prefillable glass syringes are available in 0.5 mL, 1 mL (and up) formats with Luer-lock or staked needles . They employ tight dimensional tolerances and a controlled silicone application so that sub-visible particle specs are met even for sensitive uses (e.g. USP <789> limits for ophthalmic injections) . Studies have shown that a baked-on silicone glass syringe produces far fewer particles than a regular silicone-lubricated disposable . In one analysis, “prefilled baked-on silicone glass syringes [had] a marked improvement over transfer syringes” in particle load – virtually no large (>10 µm) particles were shed. Only a higher count of tiny (1–10 µm) droplets distinguished them from completely silicone-free systems . If using a baked-silicone syringe for multiple doses, note that over very long storage times the silicone layer can degrade or migrate , but for one-time use (or short-term reuse) this is not a concern. Availability: Empty baked-on siliconized syringes are not commonly sold retail, but certain medical suppliers or compounding pharmacies might provide them. For example, some bevacizumab (Avastin) ophthalmic kits include a pre-siliconized glass syringe for the pharmacy to fill . If you have access to such supply channels, you could inquire about 1 mL long glass syringes with baked silicone (often from BD, Schott, or Gerresheimer). These will have Luer-lock caps and typically come sterilized and ready-to-fill.
  • Silicone-Oil-Free Syringes: Newer syringe systems eliminate silicone oil entirely by using innovative plunger coatings or advanced plastics. Gerresheimer, for instance, offers “silicone-oil-free glass syringes” that use a ceramic-coated (tungsten-free) glass barrel and LubriGone® coated rubber stoppers – this combination creates a prefillable syringe “completely free of silicone oil, coating and tungsten” . Without lubricant, the plunger doesn’t stick thanks to the special low-friction stopper surface. Another example is the Terumo PLAJEX™ 0.5 mL syringe, which is actually made of cyclo-olefin polymer (COP) but designed as a glass alternative: it uses an “i-coating” technology on the stopper that “eliminates the need of silicone oil in the syringe,” preventing any silicone droplets from being injected . This syringe comes sterile and ready-to-fill, and is aimed at intravitreal (eye) injections where even nanoscopic particles are problematic . In testing, silicone-free polymer syringes like this have shown the lowest particle counts of all, outperforming even baked-on glass in the sub-10 µm range . Availability: Silicone-oil-free syringes are cutting-edge and primarily distributed B2B (to pharma companies). You might encounter them only if a particular medication is supplied in such a syringe or if a compounding pharmacy specifically uses them. If you’re determined, you could contact the manufacturers’ reps (Terumo, Gerresheimer, etc.) for samples, but for a typical consumer it’s challenging to buy these outright. They are worth knowing about – for instance, if you are having semaglutide prepared by a compounding pharmacy, you could request it be dispensed in a silicone-free glass syringe (the pharmacy might use something like a Daikyo Crystal Zenith® polymer syringe or a silicone-free staked-needle syringe for you ). This would ensure virtually no particulate shed into your dose.

Needle Compatibility and Other Tips

All of the syringes above (glass or COP, Luer-lock or slip) use standard Luer connections, so you can attach any compatible needle. Insulin-style needles in 31G are available with Luer hubs – for example, 31 gauge × 5 mm or 8 mm hypodermic needles (commonly used for subcutaneous injections) will twist or push onto these syringes just like any other needle. The fine-gauge needle will not be pre-attached (unlike typical insulin syringes), so you’ll need to purchase the needles separately. Ensure you get Luer-lock needles if using a Luer-lock syringe. (Most small-gauge needles come in both Luer-lock and slip variants; Luer-lock is preferable for a secure fit.) The glass syringes themselves are quite compatible with these – e.g. the metal Luer collar on a syringe is built to ANSI standard, so “all Luer needles lock into the tip with an easy twist” .

Because these syringes are small (1 mL or less) and often designed for low dead-volume, you won’t lose much medication in the hub. Some 1 mL designs (especially “tuberculin” style or those labeled low dead space) have a plunger that extends into the tip to minimize wasted space . For example, Norm-Ject’s 1 mL syringes have a “dose-saver” design that can save ~0.045 mL per syringe compared to generic designs – useful when every drop counts. If using a detachable needle, a tiny bit of fluid can remain in the needle hub; using a low-dead-space needle (or the smallest hub possible) can mitigate this. Some specialty needles designed for insulin pens or syringes have super-small hubs, but they may not be directly compatible with Luer threads. A good solution is to use micro Luer-lock needles (29G–31G) from medical suppliers – brands like BD, TSK, or Nipro make ultra-fine Luer-lock needles for subcutaneous injection. These will ensure that the entire system remains low-volume and precise.

Summary: To minimize microplastic and silicone exposure, choose a glass-barrel syringe in the 0.25–1 mL range, pair it with a fine-gauge Luer needle, and avoid traditional silicone-lubricated disposables. Reusable glass syringes (1 mL size) with ground-glass plungers are a proven solution – they’re inert, have precise markings, and no added lubricants. If you require a single-use option, consider sterile glass syringes with rubber piston (or a silicone-free 2‑part plastic syringe like Norm-Ject) which are free of silicone oil . At the very high end, pharmaceutical-grade prefillable syringes offer baked-on silicone or silicone-free technology, virtually eliminating particulates – though these are harder to source. All these options meet the criteria of being compatible with insulin needles and providing accurate dosing for a 1 mg (0.25 mL) semaglutide injection. By using such a syringe, you can significantly reduce exposure to microplastics and silicone oil, making your injections as pure and precise as possible.

Sources: High-quality glass syringes can be purchased via scientific supply companies or specialty retailers (Air-Tite, Sigma-Aldrich, Thomas Scientific, etc.), and some are available on Amazon or eBay. The references below include product pages and technical discussions for further reading on each option discussed. Good luck with your search, and kudos for taking the initiative to find a safer injection tool for your semaglutide therapy!

References:

  1. Microplastic shedding from standard syringes ; Silicone oil in syringes and particulate concerns .
  2. Air-Tite “Truth”/Fortuna glass syringe specs ; Luer tip compatibility .
  3. Socorex Dosys all-glass syringe features .
  4. Norm-Ject 2-part syringe (no silicone/no rubber) description .
  5. Terumo PLAJEX 0.5 mL silicone-free syringe info .
  6. Study on baked-on vs. silicone-free syringe particles .
  7. Gerresheimer silicone-free glass syringe (LubriGone stopper) .
  8. Schott syriQ glass syringe formats (0.5–3 mL, Luer-lock) .
  9. Amazon glass syringe product note (borosilicate, reuse) .