The people who found closer to 50% in their urine probably had a slight vitamin B12 deficiency, and some of the vitamin was stored for later use
As always, if you are taking prescription medications, it is best to consult with your healthcare provider before starting a new supplement routine
Badve SV, Bilal A, Lee MMY et al (2025) Effects of GLP-1 receptor agonists on kidney and cardiovascular disease outcomes: a meta-analysis of randomised controlled trials
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Fertil Steril 84:662671 Sigman M, Glass S, Campagnone J, Pryor JL (2006) Carnitine for the treatment of idiopathic asthenospermia: a randomized, double-blind, placebo-controlled trial