Latin species name + tissue (skin/scale/cartilage) + collagen type declaration; authenticity method offered (PCR mini-barcode / LC-MS/MS biomarkers) where substitution risk matters.

≥ 90%–96% on dry basis by Kjeldahl/combustion — with the nitrogen conversion factor noted. Watch for nitrogen inflation from added free amino acids.

Typically double-digit percent of the protein (commonly ≥ 9%–12%) — the signature amino acid that anchors authenticity and purity.

Average MW with method (GPC/SEC) and degree of hydrolysis; band targets (e.g., 1,000–3,000 Da) stated for low-MW grades.

Moisture, ash, pH (10% solution commonly 5–7), solubility (cold water); heavy metals (marine: arsenic + lead specifically), microbiology, residual solvents not typical but confirm process.

Allergen statement (fish for marine), BSE/TSE for bovine/porcine, halal/kosher certificates where claimed, origin/traceability statement, lot number and shelf life (commonly 24 months).

Peptides dissolve in cold water without gelling — the core advantage over gelatin for RTD beauty drinks, shots, sachets and gummies. Validate dissolution speed and clarity at your solids level.

Neutral profiles are the specification ideal; marine grades can carry a faint fish note — mask with citrus/berry systems or specify low-odor grades for delicate flavors.

Beauty formats commonly deliver 2.5–10 g/day; joint-positioned formulas 10 g/day; tripeptide grades enable small-dose premium formats. Plan scoop/capsule counts accordingly.

Frequent partners: vitamin C (collagen synthesis cofactor), hyaluronic acid, biotin, astaxanthin, ceramides. Each partner needs its own spec and the claims matrix needs review.

Hygroscopic powder: desiccant in opened drums, reseal promptly, watch moisture/ash limits at re-test; agglomerated instant grades flow better in sachet lines.

Peptides are comparatively robust across pH ~3.8–7 food systems; run accelerated stability in acidic RTD matrices and monitor browning/Maillard with sugars.

Collagen peptides are fully enzymatically hydrolyzed (roughly 2–10 kDa, cold-water soluble, non-gelling); gelatin is partially hydrolyzed with large fragments that gel and dissolve only warm; undenatured type II collagen (UC-II) is not hydrolyzed at all and works via a different mechanism at small doses. They are three ingredients with three specifications.

Chain length drives solubility and absorption behavior: standard peptides average 2,000–5,000 Da, low-MW grades target below 2,000 Da, tripeptide grades around 500 Da. But hydrolysates are mixtures — the average alone doesn't describe the distribution or peptide profile. Require the MW method (GPC/SEC), the degree of hydrolysis and the band target for low-MW grades.

Hydroxyproline is collagen's signature amino acid, typically double-digit percent of the protein. It anchors authenticity and purity: nitrogen-based protein assays (Kjeldahl) count any nitrogen — including added free glycine or proline used to inflate numbers — so a hydroxyproline cross-check exposes dilution that the protein line alone cannot.

Hydrolysis degrades DNA, so finished-product authentication leans on LC-MS/MS peptide biomarker analysis (validated to roughly 0.05% contamination for porcine/bovine/donkey markers) or short-fragment DNA mini-barcoding; standard full-length PCR works better at the raw skin/scale stage. Amino-acid profiles serve as a secondary cross-check only.

Marine material carries fish — a major allergen requiring declaration ("marine collagen" on a front label is not an allergen statement — the species must appear). Bovine/porcine material needs species disclosure plus BSE/TSE certificates; porcine is incompatible with halal/kosher; mammalian collagens are relevant to alpha-gal syndrome consumers. Match documentation to the destination market's labeling law.

Fish tissues can accumulate trace metals, and market analyses of marine collagen supplements have found arsenic the most common trace contaminant followed by lead, with wide brand-to-brand variation. Require numeric ICP-MS results per lot against your destination limits rather than "pass" statements.

Only destination-market-permitted claims. Disease claims (arthritis, osteoporosis), wrinkle-removal promises and guaranteed timelines are prohibited; EU/UK products may only use register-authorized health claims — broad skin/joint claims for collagen are not generally authorized — and US structure/function claims need substantiation and the DSHEA disclaimer. Caution language for fish allergy and, where appropriate, oxalate/stone-forming consumers belongs in label review.