Medical disclaimer

Not medical advice

Everything on Learning Health is general educational information about published research. It is not medical advice, it does not establish a clinician-patient relationship, and it must not be used to diagnose, treat, cure or prevent any condition.

Nothing here is a recommendation to take, avoid, start or stop any substance, supplement or medicine. If you are considering any compound discussed on this site, talk to a qualified healthcare professional who knows your medical history, your current medications and your circumstances. If you are already taking something and have concerns, speak to a clinician before changing anything.

What is deliberately absent

This site contains no dosing guidance, no protocols, no cycles and no instructions for self-administration. It does link, from compound names, to a partner store. That is deliberate, and it is not an endorsement of any product’s quality.

Reports do state what was administered in a published study — the amount, route and duration — because those details are part of what the evidence means. Describing a trial is not prescribing. Nothing in a study description should be read as a suggestion that you do the same thing, and for almost every compound covered here there is no established human dose that could responsibly be recommended.

Most of these compounds are not approved medicines

With one exception, the compounds in this atlas are not approved by the FDA, the EMA or comparable regulators for the uses they are discussed for. Several are not approved for any use at all. Some are sold as cosmetic ingredients or food supplements, which regulates their safety but says nothing about whether they work. Some are sold as “research chemicals” with a disclaimer that they are not for human consumption — a legal device, not a quality standard.

“Not FDA-approved” is a factual statement about regulatory status. It does not mean a compound is dangerous, and it certainly does not mean it is effective.

Product quality is a real and documented risk

Where a compound has no approved pharmaceutical source, the material available is unregulated. This is not hypothetical:

• Official medicines control laboratories in Europe analysing seized injectable peptide preparations have found contents that did not match labels, substances still in preclinical development, and in two products haemolytic Bacillus cereus.
• In 2019 and again in August 2026, the FDA warned about compounded intravenous glutathione made from supplement-grade material. Patients developed fever, chills, pain, dizziness, shock-like and sepsis-like symptoms consistent with excess bacterial endotoxin, with hospitalisations in both episodes.
• When FDA scientists reviewed several peptides in 2026, the problem they raised first was chemical identity — for some substances, no universally accepted formula existed.

A sterile-looking vial with a printed label and a certificate of analysis supplied by the seller establishes none of these things.

Injection carries risks independent of the substance

Self-injection of any material risks infection, abscess, injury to nerves and blood vessels, and the specific danger of endotoxin, which is not removed by sterilising filtration and can cause severe systemic reactions even when the active ingredient is harmless.

Sport and employment testing

Several compounds in this atlas are prohibited in sport at all times, including under the World Anti-Doping Agency’s catch-all class for substances with no regulatory approval for human therapeutic use. Anti-doping status is reported on each page as a factual matter and may change; the Prohibited List is revised annually and comes into force each January. Athletes subject to testing should verify current status with their anti-doping organisation and never rely on a website for it. Professional leagues and employers may apply different rules.

Accuracy and currency

We make a serious effort to describe studies and regulatory positions accurately, and each report carries the date it was last reviewed. Even so, this information may be incomplete or out of date, and the regulatory situation for peptides was changing rapidly throughout 2026. No warranty of accuracy or completeness is given. Verify anything that matters against the primary source — the published paper, or the regulator’s own website.

In an emergency

If you think you are having a serious reaction to anything, contact emergency services or your local poison control centre immediately. Do not wait, and do not look for the answer online.