Metabolic and GLP-1
Semaglutide
Approved, and the evidence is not the problem
- What circulates
- Prescription doses, often from grey market vials
- What was studied
- Large randomised placebo controlled trials
- The gap
- Convention lands on a studied dose
- How long it lasts
- About seven days in people, which is why it is a weekly shot. The natural gut hormone it is copied from lasts about two minutes.
What it actually is
What it is supposed to do
What people take it for
The dose question
- What circulates
- Prescription doses, often from grey market vials
- What was studied
- Large randomised placebo controlled trials
- The strongest evidence base of anything on this site
Lands on a studied dose
The risk moved off the molecule and into the vial. Three tested vials were far less pure than claimed and simultaneously over label, so careful dosing meant overdosing.
Reported because it is what people use. Nothing here recommends any amount.
How long it lasts
About seven days in people, which is why it is a weekly shot. The natural gut hormone it is copied from lasts about two minutes.
Route studied
Weekly injection of pharmaceutical product, in large trials. Also approved as a pill.
Route used
Weekly injection at home, often mixed by the person from a powder vial.
How to check you have the right molecule
The only check that means anything is an independent lab test on the actual batch in your hand, compared against two numbers. When three vials bought from online sellers were tested in 2024, purity came back at 14.37%, 8.97% and 7.7% against the 99% advertised, meaning the powder was mostly other material. At the same time all three held 28.6 to 38.7 percent more actual semaglutide than the label claimed. All three carried bacterial toxin, and against 22 standard pharmacy quality criteria the samples failed 13 and 14.
Walked through on two real certificates in how to read a certificate of analysis.
What people get wrong
What is known about harm
Others in Metabolic and GLP-1
The full entry
Everything on this page is a summary. Read the full entry on Semaglutide for the citations, the studies, and the reasoning behind every figure above.
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