Peptide regulations and Testing methods

RUO — Research Use Only

A designation indicating a product is intended for legitimate laboratory research, not clinical/human use. It is not a magic legal shield.

Intended Use

What regulators determine the product is actually being sold or promoted for. Website wording, instructions, testimonials, product presentation, and communications can all matter.

Unapproved Drug

A product regulated as a drug that has not received the required authorization to be legally marketed for that use.

Drug Claim

A statement that a product diagnoses, treats, prevents, cures, mitigates disease, or otherwise has drug-like effects. Extremely important for peptide marketing.

Peptide

A chain of amino acids linked together by peptide bonds.

Amino Acid

The individual molecular building blocks making up peptides and proteins.

Sequence

The exact order of amino acids in a peptide. Example notation might look like Ala-Gly-Leu-….

API — Active Pharmaceutical Ingredient

The biologically active chemical substance in a pharmaceutical product. In legitimate pharmaceutical manufacturing this has a specific regulatory meaning.

Molecular Weight / Molecular Mass

The mass of the peptide molecule, commonly expressed in Da or g/mol. MS testing can help confirm it.

Lyophilized / Lyophilization

Freeze-dried material/powder. Lyophilization removes water under vacuum to improve handling or stability.

COA — Certificate of Analysis

Documentation reporting test results for a specific batch or lot.

Lot / Batch

A defined quantity manufactured during a particular production run under specified conditions.

Identity

Whether the substance actually is the molecule claimed on the label.

Purity

How much of the detected chemical material corresponds to the desired peptide versus related impurities.

Assay / Content

Measurement of how much target material is actually present.

Peptide Content

The amount of actual peptide in the material after accounting for water, salts, counterions and other components. This is not necessarily the same as chromatographic purity.

HPLC — High-Performance Liquid Chromatography

One of the most important analytical methods used to separate peptide from related substances and estimate chromatographic purity.

LC-MS — Liquid Chromatography–Mass Spectrometry

Combines chromatographic separation with mass analysis; valuable for identity and impurity characterization.

Mass Spectrometry / MS

Measures mass-to-charge ratios and helps verify molecular identity.

Specification

Predetermined acceptance criteria a batch must meet, such as identity, assay, purity, water, etc.

Release Testing

Testing performed before a batch is formally accepted/released.

Endotoxin

Bacterial lipopolysaccharide contamination that can cause serious reactions. Chemically pure does not automatically mean endotoxin-free.

Sterility

Absence of viable microorganisms under a specified sterility test. Again, 99% HPLC purity ≠ sterile.

cGMP / GMP — Current Good Manufacturing Practice

Quality requirements governing controlled pharmaceutical manufacturing environments, documentation, processes, personnel, equipment and testing.

Stability

How identity, purity, content and other properties change over time under particular storage conditions.