You may have heard that it’s necessary to consume vitamin C (also called ascorbic acid) at the same time as collagen peptides to properly metabolize and benefit from collagen supplements. However, there is no credible claim that vitamin C helps with "absorption" of a collagen supplement from the intestinal tract i.e. that more Glycine-Proline-Hydroxyproline peptides will end up in the bloodstream thanks to the consumption of vitamin C.
However, vitamin C is a key nutrient for collagen synthesis in the body. Without adequate vitamin C, collagen is unable to form the cross-links that provide strength and structure to your connective tissues (2). Vitamin C is also a powerful antioxidant that helps reverse free radical damage caused by exposure to stressors and environmental toxins.
If you’re consuming adequate vitamin C levels through diet (90 mg/day), i.e. fruits and vegetables, then vitamin C supplementation will not further enhance collagen synthesis in your body, but will it will not harm you either, since vitamin C is water-soluble and the excess will be eliminated through urine. However, if your diet is deficient in vitamin C, then you would benefit from the acerola (rich in vitamin C) present in many Landish products, including our Marine Collagen Beauty Blend, Antioxidant Mixes, Functional Plant-Based Latte Mixes, and 5 Plant Protein.
References:
Choi, SY, Ko, EJ, et al (2013). Effects of collagen tripeptide supplement on skin properties: a prospective, randomized, controlled study.
Maxfield, L., & Crane, J. S. (2022). Vitamin C Deficiency. In StatPearls. StatPearls Publishing.