Yes, regular consumption of collagen may benefit hair health and growth. Collagen is abundant in the amino acid proline, which is needed for the production of keratin, the structural building block of hair and nails (1). Keritin's function is to smooth the hair cuticle to give it a healthy and shiny appearance and to produce new hair follicles that are required for growth (1).
Research shows that oxidative stress caused by environmental and lifestyle factors––such as pollution, smoking, poor dietary choices and alcohol––can have a negative effect on hair follicles, which determine hair growth, texture and thickness (2). The consumption of marine collagen may help to improve follicle health, as it has been shown to reduce oxidative stress by promoting radical-scavenging activity (3). A frequent comment from Landish customers following several weeks of consuming this product is more hydrated, stronger and less brittle hair, which could be attributed to improved follicle health. Collagen consumption has also been shown to improve hair pigment, as oxidative stress has been linked to hair greying (3).
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References:
Bragulla, H. H., & Homberger, D. G. (2009). Structure and functions of keratin proteins in simple, stratified, keratinized and cornified epithelia. Journal of Anatomy, 214(4), 516–559.
Trüeb, RM. (2015) The impact of oxidative stress on hair.
M, Seiberg. (2013) Age-induced hair greying - the multiple effects of oxidative stress.
Abedin, Z, et al. (2014) Biochemical and radical-scavenging properties of sea cucumber (Stichopus vastus) collagen hydrolysates.