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Peptides are different biologic tools with different questions around source, formulation, route, regulatory status, and evidence
View our intramuscular injection guide
RUO products, including everything sold by 99 Purity Peptides, remain governed by an entirely different framework: labeled and sold strictly for in-vitro laboratory research, not for human administration, and not requiring a prescription because they are not marketed as drugs
Test 1: Serum B12 What it measures: Total circulating cobalamin (active + inactive forms)
The vitamin is mostly present in animal-based foods such as meat, eggs, fish, and milk
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