Vitamin C and Collagen: study protocols

4 study groups took Vitamin C together with Collagen. These are the doses the studies gave. They are not a recommendation.

Fewer than 5 study groups in one unit match, too few to draw the chart.

Commonly used together

3 of 4 study groups took Vitamin C and Collagen with something else, but nothing that 3 or more different studies gave.

4 study groups

Study
The Effects of Dietary Supplementation with Collagen and Vitamin C and Their Combination with Hyaluronic Acid on Skin Density, Texture and Other Parameters: A Randomised, Double-Blind, Placebo-Controlled Trial 2024 · CP group · Healthy Caucasian women aged 40–65 years with skin ageing	80 mg	5 g	16 weeks	30
The Effects of Dietary Supplementation with Collagen and Vitamin C and Their Combination with Hyaluronic Acid on Skin Density, Texture and Other Parameters: A Randomised, Double-Blind, Placebo-Controlled Trial 2024 · CPHA group · Healthy Caucasian women aged 40–65 years with skin ageing	80 mg	5 g	16 weeks	30
A Collagen Supplement Improves Skin Hydration, Elasticity, Roughness, and Density: Results of a Randomized, Placebo-Controlled, Blind Study 2019 · verum group · Women aged 35–73 with healthy skin	80 mg	2.5 g	12 weeks	36
A Dermonutrient Containing Special Collagen Peptides Improves Skin Structure and Function: A Randomized, Placebo-Controlled, Triple-Blind Trial Using Confocal Laser Scanning Microscopy on the Cosmetic Effects and Tolerance of a Drinkable Collagen Supplement 2020 · test product (Elasten) · Women aged 40–70 years; healthy, without a stated skin disease	80 mg	2.5 g	12 weeks	30