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The pep4U blog

Plain-language explainers, news and honest takes on peptides. New posts weekly.

August 17, 2026 · 4 min read

A Glutathione Recall, and Why Compounded Quality Is a Real Risk

A compounding pharmacy recalled glutathione injections over contamination. Here is what happened, and why compounded quality is a real risk with anything you inject.

NewsSafety
August 10, 2026 · 6 min read

The Weight-Loss Peptides, Explained: Semaglutide vs Tirzepatide vs Retatrutide

A plain beginner's guide to semaglutide, tirzepatide, and retatrutide: how they differ, and where each one stands.

ExplainerMetabolic
August 3, 2026 · 5 min read

What 'Research Use Only' Actually Means

Half the peptides you read about are sold 'for research use only.' Here is what that label really means, and why peptide legality is so confusing right now.

ExplainerRegulatory
July 27, 2026 · 4 min read

An FDA Panel Just Voted in Favor of Six Popular Peptides

In July 2026 an FDA advisory panel recommended adding BPC-157, TB-500 and others to the compounding list, against the agency's own advice. Here is what that does and does not mean.

NewsRegulatory
July 20, 2026 · 5 min read

BPC-157, Explained: What the Research Actually Shows

BPC-157 is one of the most talked-about recovery peptides. Here is what the science shows, what it does not, and the tumor question most sites skip.

ExplainerHealing
July 13, 2026 · 5 min read

Peptides 101: What They Actually Are, and What the Hype Gets Wrong

A plain-language beginner's guide to what peptides are, why the excitement is real, and where the hype gets ahead of the facts.

BeginnerExplainer

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