Page 1 - Reviews - Carlson, Pro-Rite, 200 Vegetarian Capsules - iHerb
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Customer Ratings & Reviews

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4.9
Based on 945 ratings
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Customer reviews (243)
Product reviews solely reflect the views and opinions expressed by the contributors and not those of iHerb. iHerb does not verify or endorse any claims made in these reviews. Statements regarding food supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.
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Posted on Mar 31, 2026
United States
722
9
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2,325
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Active ingredients and their forms L-proline (500 mg per 2-capsule serving). An essential (or rather, conditionally essential) amino acid, critically important for collagen synthesis. It makes up approximately 15% of the collagen molecule and ensures the structural stability of connective tissue. Without sufficient proline, collagen fibers become loose. L-lysine (500 mg per 2-capsule serving) - in the form of L-lysine hydrochloride. An essential amino acid that acts as a "cross-linking agent" in collagen fibers (forms cross-links), giving them strength. Lysine is also important for calcium absorption and immune support. Form: Free amino acids (free-form), not part of dipeptides or protein hydrolysates. This means they do not require additional breakdown and are quickly absorbed. Proline + lysine are a classic pair for collagen synthesis. They work in tandem: proline provides the "framework," and lysine provides the strength and stability of the fibers. Together, they produce a synergistic effect that is not possible when taken separately. Additional Information: Vitamin C (a cofactor) and copper are also necessary for maximum collagen synthesis. This product doesn't contain them, but that's not a drawback—it's a monocomplex that can be combined with other supplements. What's important: 500 mg of proline and 500 mg of lysine per serving (2 capsules). The dosage is maintenance-grade, but you can increase it to 4 capsules if desired (for example, when recovering from injuries). The ingredients are a purist's dream: The capsule contains only the amino acids themselves and a vegetable capsule (hypromellose). No magnesium stearate, silicon dioxide, colorings, or fillers. This is rare for amino acids—usually they're added "for fluidity." Nothing extra here.
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