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Compounds · Other compounds · continued

AOD-9604 and the fragment hypothesis, revisited posts 31–45

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

TM
t.marchettiTL228 Nov 2025#31
j.baptista, post #3: Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which puts it in a different evidential category from most of its neighbours here. Go to post

The most useful thing anyone has posted about AOD-9604 in this category was a table of what had been measured and by whom. That is what I would want again.

17 likes in reply to #3 8mo
I
IHollingworthTL2Member3 Dec 2025 · edited#32

Post #31 is right about the mechanism and I think understates the practical bit.

AOD-9604 has been discussed here with more heat than it deserves, mostly because two definitions have been in play the whole time.

6 likes 8mo
CN
c.nybergTL27 Dec 2025#33

Good question, well framed, and I would like to see it answered properly.

0 likes 8mo
LS
l.sarkissianTL2Member11 Dec 2025#34

Anyone submitting an unusual compound for testing should tell the laboratory what it is rather than what it is sold as. Method selection depends on the structure and the trade name may not identify it.

It is a small point and it changes the answer, which is an awkward combination.

32 likes 8mo
RS
r.sobczakTL215 Dec 2025#35
RJ
r.jhannsdttirTL3Regular19 Dec 2025#36

Adding a null result on AOD-9604. I looked, carefully, and found nothing, and null results deserve posting precisely because they never are.

3 likes 7mo
PN
p.novakTL223 Dec 2025#37

On post #36 — agreed on the reasoning, with one qualification.

I think the AOD-9604 question is answerable and has not been answered, which is a more optimistic position than most of this thread.

0 likes 7mo
EA
e.almeidaTL2Member27 Dec 2025#38
d.petrescu, post #8: Clear enough that I do not think I have a follow-up, which is unusual. Go to post

Picking up post #36: that is the part I would want checked first.

Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which puts it in a different evidential category from most of its neighbours here.

I have left out the parts I could not verify.

24 likes in reply to #8 7mo
PK
p.krastevTL231 Dec 2025 · edited#39
l.sarkissian, post #34: Anyone submitting an unusual compound for testing should tell the laboratory what it is rather than what it is sold as. Method selection depends on the structure and the trade name may not identify it. It is a small point and it changes the answer, which is an awkward combination. Go to post

When "no data" is the complete and final answer: if there is no published human data on a compound, that is the state of knowledge. Hope is not a substitute and reasoning from theory is not a substitute. That is not a reason for shame; it is the honest epistemic position.

That is a description of practice, not a recommendation of it.

31 likes in reply to #34 7mo
RV
r.venkatesanTL3Wiki editor4 Jan 2026#40
m.haddad, post #26: Right — I had this wrong and I am glad to have read it before it mattered. Go to post

A request rather than an answer: could whoever has the primary source for AOD-9604 post it? I have seen the claim three times this month and each version had lost a qualifier.

16 likes in reply to #26 7mo
HS
hana.satoTL4 Moderator8 Jan 2026#41
r.venkatesan, post #40: A request rather than an answer: could whoever has the primary source for AOD-9604 post it? I have seen the claim three times this month and each version had lost a qualifier. Go to post

Bookmarking this. I will come back when I have something worth adding.

5 likes in reply to #40 7mo
NO
n.okwuosaTL212 Jan 2026#42

Where I part company with post #38, and it is a narrow parting.

Fragment compounds — where the material is part of a larger natural protein — should be identified by sequence rather than by name, because the naming in this space is inconsistent between suppliers.

That matches what I was told, which is not the same as knowing it.

14 likes 6mo
PI
p.iyer_pharmdTL3Pharmacist16 Jan 2026#43

Source for the AOD-9604 figure, since it was asked for. It is in the discussion rather than the abstract, which is why the version circulating is stronger than the paper is.

Reading the surrounding paragraph is worth the two minutes. The authors are more careful than their summarisers.

29 likes 6mo
HI
h.iyerTL220 Jan 2026 · edited#44
m.broberg, post #29: The failure mode on AOD-9604 is boring rather than dramatic. It is almost always the step everyone assumes was done correctly because it is too simple to get wrong. Go to post

Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which puts it in a different evidential category from most of its neighbours here.

Speaking for myself and not for anyone else who has posted here.

0 likes in reply to #29 6mo
BI
blank_injectionTL2Analytical chemist24 Jan 2026#45
r.venkatesan, post #40: A request rather than an answer: could whoever has the primary source for AOD-9604 post it? I have seen the claim three times this month and each version had lost a qualifier. Go to post

AOD-9604 is a fragment of human growth hormone and has been discussed as a potential weight-loss agent based on theoretical mechanism. The fragment hypothesis — that the fragment retains a specific property of the intact hormone — is not settled for this compound.

That is where I would start, not where I would stop.

2 likes in reply to #40 6mo

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