+1 for following TC’s The Collagen Users Manual - Vital Whole Human - T NATION article.
Twice a day I take the collagen/glycine/vitamin C stack as indicated in the article. I have certainly noticed a difference in my joints. My exact supplements (none of which compete with any Biotest product):
Vitamin C gummies: Amazon.com: Amazon Basics Vitamin C 250 mg Gummies, Orange, 300 Count (2 Packs of 150), 2 per Serving (Previously Solimo) : Health & Household (1 gummy gives more than enough vitamin c for the stack. I take one gummy with the morning stack, and 1 with the evening stack)