Hi Dr. Grace. Your explanation and experience are fabulous. Just a sharing here: My sister and I personally have been taking collagen for years. My sister 46 years old look like 30 years old and I 40 years old look like 27 years old. We had been tried various collagen sources and brands. Cow source is similar to human cells. Collagen needs 3 - 6 months to erase human-damaged cell memories. If you add vitamin C while you consume collagen peptides, it helps you to maintain your collagen longer in your skin. Choose hydrolyzed collagen from a cow source, 2.5 - 15 grams per day, 2.5g/day for skin hydration, elasticity, and support joint health. 5 - 15 grams/day to support bone and joint health.
Thanks for this topic! I have been taking Swisse Beauty Collagen Glow With Collagen Peptides since last year and I found my skin condition is brighter and better.