Collagen peptides

胶原蛋白肽 Collagen Peptides

Place · Level 3 · Supplement

吃啥补啥最经典误区 · vitamin C 才是真协同 · 关节、皮肤 B 级证据 · 营销 ≫ 证据

Connected to · 3

synergy · 1

Training injuries
Shaw 2017: 15 g collagen peptides + 50 mg vitamin C 30-60 min pre-training → tendon collagen synthesis ↑. Useful in tendinopathy rehab.

contrast · 2

Joints · Cartilage & Tendon
Collagen peptides fixing joints overpromises: some trials show subjective joint-pain improvement in active people, but that is a symptom signal, not cartilage being rebuilt. First line for joints remains exercise and weight loss.
Glucosamine + Chondroitin
Two neighbours on the joint-supplement shelf, routinely compared: collagen peptides actually carry slightly firmer joint evidence than glucosamine — but both stop at subjective symptoms, and neither has shown cartilage regrown.

Triple helix

Stop 1/5

身份 · 三股螺旋

Collagen is the body's most abundant protein — about 25–30% of total protein. It forms structural scaffolds in skin, bone, cartilage, tendons, ligaments, vessel walls, and sclera.

Its structure is distinctive: a right-handed helix of three α chains, each a repeating (Gly-X-Y)ₙ sequence where:

Glycine (Gly) occupies every third amino acid position — only Gly's tiny side chain fits the center of the helixX position: often proline (Pro)Y position: often hydroxyproline (Hyp) — a post-translational modification adding an -OH to Pro, and this step requires vitamin C as a cofactor
Collagen peptides = partly hydrolyzed collagen — heat plus enzymatic cleavage break the large triple helix into 2–10 kDa short peptides (5–30 amino acids). These short peptides form a gel when cooled (gelatin); further hydrolysis yields cold-water-soluble collagen peptide powder — the form sold by Vital Proteins, Great Lakes, NeoCell, etc.

Practical difference between the two product forms:

Gelatin: partly hydrolyzed; forms a gel in cold water; used in cooking (jellies, mousses) and can be taken orallyCollagen peptide (hydrolyzed collagen): further-hydrolyzed short peptides; dissolves in cold or hot water; no gel feel
The amino acid composition of the two is essentially identical — both are Gly + Pro + Hyp-rich mixtures with 90%+ total protein content. The marketing difference is mainly 'easy-dissolve vs cooking-use', not 'bioactive potency'.

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Educational content, not medical advice — consult a clinician.