#48

OK, now I know: the lowest dose (2.5 mg/kg) was administered via intraperitoneal injection: “Urolithin A group: hAbKI mice were administered with urolithin A (2.5 mg/kg body weight) (i.p.), optimized in our lab, 3 times per week for 4 months” whereas the larger doses (25 mg/kg or 50 mg/kg) were administered orally either mixed with food or given via gavage in liquid form.

And according to this paper:

therapeutic potential of UA is constrained by poor bioavailability

So this can explain the 10x difference in dosing between oral and IP UA. This solves the dose question in mice at least. The dosing schedule question is still open: pulsing? how often?

This study (already cited) might also answer your question @约瑟夫_拉维尔:

Density and number of mitochondrial cristae was markedly decreased with age, as evidenced by the loss of strict parallel position (Fig. 2A and 2B). UA intervention rescued the age-dependent decline in cristae volume density to levels compared to those observed in young animals (Fig. 2A-B). Interestingly, mitochondrial cristae were more circular with age, while UA administration to old animals reverted such increase (Fig. 2C). Regarding mitochondrial morphology, mitochondria were smaller in old compared to young animals, an effect rescued by UA administration (Fig 2D). No differences in mitochondrial volume density and mitochondrial number were observed with UA in either young or old mice (Suppl. Fig. 2A and 2B). These results indicate that age-associated alteration in heart mitochondrial morphology and ultrastructure are reverted by 2 months of UA supplementation, while neither aging nor UA affected mitochondrial content.

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So it looks like among young mice, 2 months of UA supplementation has no effect whereas it reverses age-associated alterations in old mice. So can it be useful in healthy individuals? I don’t know. What are ways to measure mitochondrial health? (volume density as they did?)

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#49

@adssx This is excellent information. Thank you. Do you still think a short term, periodic use of urolitin a (500mg/ day or every other day) for a month would work in an older person like an older mouse?

#50

I don’t know.

The most related paper we have is this one by the Mitopure team: Urolithin A improves muscle strength, exercise performance, and biomarkers of mitochondrial health in a randomized trial in middle-aged adults 2022

The study population consisted of untrained adults between 40 and 64 years of age. In addition, subjects were screened on the criteria of being overweight and having low physical endurance (i.e., maximum oxygen consumption [VO2max] <35 kg/mL/min). A 4-month intervention period was selected as the minimal time period to start detecting an impact on physical-performance- and muscle-functionrelated study endpoints based on guidelines and recommendations of expert groups on clinical trials focused on muscle function.

Even after 4 months in this unhealthy population, only the highest dose showed (very) significant improvements (+14.3% VO2max!):

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So I wonder:

  • Do you need long-term treatment to see the effects? (the mice studies were done for 2 months, meaning years for humans)
  • Do you need even higher doses?
  • Would pulsing increase the effects?

Also, I find it weird that their 2021 study (pomegranate juice vs Mitopure) found that:

Age had no impact on UA generation or absorption as well as UA producer status as levels were consistent across the different age groups of young, middle-aged, and elderly (Fig. 5D) both with direct UA supplementation and following PJ intake.

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#51

Interesting. I think I’m going to just keep watching this and focus on exercise, rapa, and protein cycling. I’m having good success with GG in repairing damage done / issues caused by statins so I don’t have an urgent need.

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#52

What’s GG? :sweat_smile:

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#53

Details on GG here

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#54

Thanks.

Small numbers but interesting qualitative feedback here: https://www.reddit.com/r/Nootropics/comments/13wk8h7/anyone_has_experience_with_urolithin_a_mitopure/

It looks like Mitopure can drain your energy, at least at the beginning, and cause some insomnia. It could be another reason to cycle it.

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#55

It would be interesting to see the longevity information for those individuals who naturally produce high levels of UA. These individuals have been out there for generations. Sadly, it doesn’t seem like this supplement will push us past the 120 yo age barrier.

#56

I don’t think we have any commercially available supplement or medicine that would do that yet?

Have you looked if there is any Mendelian Randomization instrumentation on this? That could help answer your first question.

#57

@Neo: do you have any thoughts on the “optimal” dosing and schedule?

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#58

I haven’t been able to spend more time on it yet.

My current rough concept / prelim thinking / is to perhaps do 3-4 sessions a year (similar to my fasting goals, but spread out roughly midway between the fasting times). And perhaps do the full “marketed” dose each day during a 4 week period to do some housekeeping of mitophagy followed by mitochondrial biogenesis. And then the rest (and majority of the time) not be on any Mitopure at all.

But this is just an idea I’m playing around with - I have not settled on it yet.

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#59

Thanks, it’s also my best guess for now. Receiving my Mitopure on Monday, I’ll probably follow the 4-w mitochondrial “housekeeping” and then see…

Another great article about UA: Mitophagy curtails cytosolic mtDNA-dependent activation of cGAS/STING inflammation during aging 2024

In old mice, pharmacological induction of mitophagy with urolithin A attenuates cGAS/STING activation and ameliorates deterioration of neurological function.
We conducted neurophysiological, behavioral, and retinal immunohistochemical and transcriptomic analyses in young (6 months) and old (22 months) mice injected intraperitoneally with UA (2.3 mg/kg) or vehicle daily for 8 weeks
Mass spectrometry (UPLC-ESI-QTOF-MS) of perfused brains, and plasma samples as positive controls, showed that free UA crossed the blood-brain barrier and reached the central nervous system.
UA treatment significantly increased mitophagy in the neuroretina (Fig. 4b) and RPE (Fig. 4c) of young and old mice, albeit to a lesser extent in the latter. Hindlimb clasping score, used as a readout of general neurological function, was significantly lower in old UA-treated mice versus vehicle-treated counterparts (Fig. 4d). Old mice treated with UA treatment also showed improved recognition memory […] UA-treated old mice showed improved scotopic (dark) vision […] Immunohistochemistry indicated that UA ameliorated CtBP2+mGluR6+ synaptic integrity in old mice (Fig. 4h), further suggesting that UA promotes the preservation of visual function during aging. UA also decreased lipid peroxidation-derived 4-HNE+ aggregates (Fig. 4i), indicating that improved mitochondria quality control may also reduce oxidative stress in the aging retina.”

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#60

Cool. Are there any tests you will do before and after?

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#61

Nothing specific behind the “basics” (A1c, lipids, etc.) I guess. Unless there’s a way to easily measure UA’s impact?

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#62

Another thing I haven’t researched yet.

@John_Hemming do you have any tests that are relevant for triangulating mitochondrial health?

One thing you could do is do some form of zone 2 output measure before and then after again (without changing you exercise regime).

From the papers you’ve been reading are their any of the assessments they were doing that we could do?

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#63

Sorry, but I don’t really have any good macro measure of mitochondrial health. I have tended to follow an increase in heart rate and blood pressure, but that only lasts a few days. Even that is not certain.

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#64

I wanted to look at that from a “qualitative” way. I’ll have a planned VO2max test but the last one was in mid 2023 so the differences, if any, might not be due to Mitopure.

In the papers, they looked at strength and Vo2 max: Urolithin A (UA) One of 4 Promising Agents 2024 by Brian Kennedy of NSU - #50 by adssx

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#65

I now have 30g of UA powder in my “substances to test” box. The week just gone was a rapamycin week (every 21 days at the moment) so I may go for this. I am pleased that my BP seems to have come back to good territory. (116/68-57 notwithstanding around 10g of sodium supplementation today)

It strikes me UA is a sort of spring cleaning substance. Is there an agreed dosing and or timing system?

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#66

I booked a free 15min call with a Mitopure “nutrition expert”. It might be useless but it was offered after I purchased :man_shrugging: If you have questions: let me know, I’ll ask her.

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#67

Question for Mito pure: how can I tell if it is working? What blood markers would indicate mitophagy and, later, improved mitochondrial function?

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