Collagen Peptides (+ Vitamin C) vs Myo-Inositol (+ D-Chiro)
Both are used for skin & hair. Here's how they compare on human evidence, mechanism, safety and availability — in plain English.
| Collagen Peptides (+ Vitamin C) | Myo-Inositol (+ D-Chiro) | |
|---|---|---|
| Human evidence | ★★★★☆ | ★★★★☆ |
| Legal status | OTC Supplement | OTC Supplement |
| How it works | Hydrolysed collagen supplies glycine/proline/hydroxyproline that preferentially accumulate in tendon/ligament; taken with vitamin C (cofactor for prolyl hydroxylase) before loading, it doubles collagen-synthesis markers. | Insulin second-messenger; the 40:1 myo:D-chiro ratio improves ovarian insulin signalling, restoring ovulation and lowering androgens in PCOS. |
| In plain English | Feeds your tendons and ligaments their raw materials right before you stress them — timing matters, so take it ~45 min before training with vitamin C. | Improves how ovaries respond to insulin — one of the best-evidenced natural treatments for PCOS (irregular cycles, acne, unwanted hair). |
| Bottom line | The most practical connective-tissue supplement; timing is key. Highly relevant to running/Hyrox tendon load. | — |
| Availability | Available over the counter | Available over the counter |
Which is better for skin & hair?
Both carry a comparable human-evidence rating (★★★★☆). Choose on mechanism fit, side-effects, availability and cost rather than evidence strength alone — they work through different mechanisms.
Full breakdowns: Collagen Peptides (+ Vitamin C) · Myo-Inositol (+ D-Chiro).
Common questions
Is Collagen Peptides (+ Vitamin C) or Myo-Inositol (+ D-Chiro) better for skin & hair?
Both carry a comparable human-evidence rating (★★★★☆). Choose on mechanism fit, side-effects, availability and cost rather than evidence strength alone — they work through different mechanisms.
What's the difference between Collagen Peptides (+ Vitamin C) and Myo-Inositol (+ D-Chiro)?
Collagen Peptides (+ Vitamin C): The most practical connective-tissue supplement; timing is key. Highly relevant to running/Hyrox tendon load. — Myo-Inositol (+ D-Chiro): Improves how ovaries respond to insulin — one of the best-evidenced natural treatments for PCOS (irregular cycles, acne, unwanted…