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best form of vitamin C for collagen production

Messages
60
Location
Michigan
What forms of vitamin C do you all use that is optimal for collagen production? Or, is ascorbic acid sufficient? Also, I've got a friend who cannot tolerate citric acid nor malic acid; he also cannot tolerate FRUIT. He is having some issues with tendon/ligament pain and tearing; any suggestions on how he can get more vitamin C in his diet WITHOUT supplementation, and without eating fruit (since he is unable to tolerate)? Thanks in advance!

:)