“A Collagen Supplement Improves Skin Hydration, Elasticity, Roughness, and Density” —https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6835901/
“Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis”– https://www.mdpi.com/2072-6643/15/9/2080
“Choline Supplements: An Update”– https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10025538/
“Dietary Choline Intake: Current State of Knowledge Across the Life Cycle” —https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6213596/
“Review: B Vitamins and the Brain: Mechanisms, Dose and Efficacy” — https://pubmed.ncbi.nlm.nih.gov/26828517/
“B Vitamins: Small Molecules, Big Effects” — https://onlinelibrary.wiley.com/doi/10.1002/jimd.12127
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