Marine versus bovine collagen for women 50+?

For Malaysian Muslim women 50+, marine collagen is the clearer choice; but bovine can be considered if active halal cert available. Main differences: (1) Source - marine from fish (skin, bones); bovine from cattle (skin, bones). (2) Halal status - marine usually easier to verify, but check the exact product label (fish don't need Syariah slaughter); bovine requires active halal cert (Syariah-slaughtered cattle). (3) Molecular size - both can be low-MW peptides, but marine usually smaller and absorbed faster. (4) Collagen composition - marine rich in Type I (best for skin, hydration, elasticity); bovine has Type I + III (skin + joints). (5) Price - marine more expensive (RM3-5/g) than bovine (RM1-2/g). Postmenopausal benefits: (a) Skin hydration and elasticity - both work, moderate evidence. (b) Bone support - both show some evidence, with König 2018 showing bone density improvement with collagen peptides. (c) Joints - bovine slightly stronger for this (Type II from cartilage). For Malaysian women: try Vital Proteins or Sports Research marine collagen 10-20g daily, in smoothies or coffee. Allow 8-12 weeks for skin effects. If you want strong joint support and active halal cert is available, bovine is the economical choice.