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Jul 16, 2026

What Peptides Actually Are, and How We Decide Whether to Prescribe One

Reviewed by:

Preyasi Kothari, MD, ABEM, MSCP

Chief Medical Officer, GYŌS · 3 min read

Peptides are having a moment, and most of what you have read about them is either a wellness promise with nothing behind it or a technical explanation that never quite lands.

Here is the plain version. A peptide is a short chain of amino acids, the same building blocks that make up every protein in your body. That is the whole definition. It describes a shape, not an effect.

Which is why the word tells you almost nothing

Insulin is a peptide. So are several of the hormones that regulate hunger, growth, and your stress response. Calling something a peptide is about as specific as calling something a pill.

What matters is the individual molecule: what it binds to, what it was actually studied for, and what its regulatory status is. Any conversation that stays at the level of peptides rather than naming one is a conversation that cannot be checked. That is usually the point.

What compounded means, and why we say it out loud

Most peptides being marketed today are not FDA-approved. They are compounded, meaning prepared by a licensed pharmacy against an individual prescription. FDA approval involves a specific review of safety and effectiveness for a defined use. Compounded preparations have not been through it.

There is a further point most peptide marketing skips. A pharmacy may only compound from substances that meet a defined legal standard, and a great many of the peptides being advertised right now do not meet it. An FDA advisory committee recommended several for approval in July 2026, but those votes are advice rather than a rule, and the formal process has not been completed. A recommendation is not an authorisation.

We do not compound anything ourselves. When a compounded preparation is right for you, it is prepared by a licensed pharmacy and we tell you plainly that it is compounded and what that means.

What we will not tell you

Peptides do not reverse aging. They will not fix fatigue or the not-quite-yourself feeling that brings most women to us, and anyone promising you a specific result is describing something the evidence does not support.

We would rather be the clinic that tells you that than the one that sells you something.

How we actually decide

Because much of this category sits outside the standard approval pathway, careful evaluation matters more here, not less.

We start with your physiology rather than with a molecule. Your history, your labs, your body composition, your hormonal and metabolic picture, and what you are genuinely trying to change. Then we ask whether anything in this category has real evidence for that, and often the answer is no.

Many women who ask us about peptides do not end up on one. That is a legitimate outcome and frequently the right one. If we do recommend something, we will tell you its regulatory status, what the evidence shows, what it does not show, and how we would know whether it is working.

If you have been offered peptides somewhere else

Bring us the name of the specific molecule and what you were told about it. We will tell you honestly what we think, including if we think you should save your money.

Book a consultation.

These statements have not been evaluated by the Food and Drug Administration. This service is not intended to diagnose, treat, cure, or prevent any disease.

This article is general health education and is not a substitute for individualized medical advice. Peptide therapies differ substantially in evidence base and regulatory status. Whether any therapy is appropriate for you is determined during physician evaluation.

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