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Vitamin C serves as an essential cofactor for collagen production and can be obtained through diet or supplementation

References For Further Reading (1) A M Reznichenko, V P Fesenko, D V Shestopalov, and P A Tatarchuk (2001) Changes in cell immunity indexes under the influence of thymalin, thyroxine and fibronectin in patients with hyperplastic diseases of thyroid gland before and after the surgery Klin Khir, 2001 Dec: (12): Pages 31-3

But because their feed usually doesnt contain enough cobalt naturally, the bacteria in their rumen that form B12 cannot form B12 anymore

Modern double-blind RCT, older human study, or mechanistic extrapolation

Dropping objects or difficulty with fine tasks like buttoning a shirt