Collagen Peptides (Bovine).

Vitamin C is the required cofactor for the prolyl and lysyl hydroxylase enzymes that hydroxylate collagen's proline and lysine residues, the step that lets the triple helix fold and stay stable. Supplying collagen peptides as building blocks alongside vitamin C gives the body both the raw material and the cofactor normal collagen formation depends on.

Lysyl oxidase, the enzyme that cross-links collagen and elastin fibers to give connective tissue its tensile strength, is copper dependent and cannot function without it. Adequate copper lets the collagen the body assembles mature into properly linked fibers.

Collagen and hyaluronic acid are both structural components of the skin's extracellular matrix, collagen forming the fibrous scaffold and hyaluronic acid holding water within it. They are routinely formulated together on the rationale that each supports a different part of normal skin structure and hydration.

About a third of collagen's residues are glycine, making it the largest amino acid demand of new collagen synthesis.

Lysine residues are hydroxylated and then joined by lysyl oxidase, the copper enzyme that gives fibrils their strength, so lysine supply and the cross-link step sit on one path.

Prolyl and lysyl hydroxylase are iron-dependent dioxygenases, so ferrous iron is required in the active site alongside ascorbate for the hydroxyproline that stabilises the helix.

Silicon concentrates in connective tissue and has been reported to support prolyl hydroxylase activity and fibril cross-linking, the reason orthosilicic acid appears in collagen formulas.

Manganese is the cofactor for the glycosyltransferases that assemble the glycosaminoglycan matrix collagen fibrils are embedded in.

Zinc is the catalytic metal in matrix metalloproteinases and is needed for normal fibroblast protein synthesis. Because high zinc competes with copper for uptake, formulas hold the two in a set ratio.

MSM supplies sulfur used in sulfated glycosaminoglycans and disulfide bonds, a building block collagen peptides do not provide.

Retinoids increase procollagen gene expression in dermal fibroblasts, acting on the synthesis instruction while the peptides supply the residues.

Chondroitin sulfate is a sulfated glycosaminoglycan of cartilage matrix that holds water between collagen fibrils, so it builds the medium while collagen builds the fibre.

Catechins bind non-heme iron and copper in the gut lumen, and those metals run collagen hydroxylation and cross-linking, so sharing a dose window lowers mineral uptake. Space the doses apart.