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Siegel, 1961): Absorption tests with food, using a flushing vitamin B12 injection to estimate absorption, indicate a reduction of the passive absorption by about 40% when supplements are taken with food rather than when fasting

Accessed June 6, 2025

"High prevalence of folic acid and vitamin B12 deficiencies in infants, children, adolescents and pregnant women in Venezuela"

78 A meta-analysis of findings from seven randomized controlled trials with a total of 693 participants found combined treatment with L-carnitine and acetyl-L-carnitine together improved sperm motility, increased the number of forward-moving and generally moving sperm, and increased pregnancy rate for men affected by infertility