Collagen production also drops quickly due to excess sun exposure, smoking, excess alcohol, and lack of sleep.
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One review of 11 studies focusing mostly on women found that taking 3–10 grams of collagen per day for an average of 69 days led to improvements in skin elasticity and hydration. Source
Another study was conducted as a clinical interventional study on 72 healthy women treated either with a collagen supplement for three months.
Compared to placebo, a significant reduction in eye wrinkle volume along with an increase of procollagen type I and elastin were reported in the collagen group over a 56 day period. Source
In the follow-up phase, the Collagen group was observed one month after the treatment to evaluate the sustainability of the changes induced by the application. The results show that all the effects were substantially retained during the follow-up period. Throughout the study, there were no adverse effects, neither for the placebo nor for the test product, which has been on the market for many years as a food supplement.