503A vs 503B Compounding Pharmacies Explained
A clear, source-grounded guide to the difference between 503A compounding pharmacies and 503B outsourcing facilities, including prescriptions, office use, oversight, cGMP, and why the distinction matt
Research insights
Explainers, comparisons and guides on peptide research, testing and handling.
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FDA Peptide Categories Explained: What Category 1, 2, and 3 Mean for Research
The FDA classifies bulk drug substances into three categories under its 503A interim policy — each with different implications for compounding eligibility and enforcement.