In an uncontrolled trial in 100 men with infertility, a combination supplement containing 800 mg alpha-lipoic acid, 100 mg betaine, 400 mcg folic acid, 1,000 mg myo-inositol, 2.6 mg B12, 1.7 mg riboflavin, and 1.9 mg B6 was tested and reported to improve sperm concentration, motility, and morphology
However, further dose-response analysis and adjustment for intake of other vitamin and mineral supplements indicated that all-cause mortality risk was significantly increased by 7% only at a dose of 2,000 IU/day, which is notably higher than the UL for adults (1,100 IU/day of synthetic tocopherol or 1,500 IU/day of natural tocopherol)
These include serious infection, uremia or renal failure, drugs with bone marrow suppression properties (e.g., chloramphenicol), or concurrent undiagnosed folic acid or iron deficiency anemia
Shaykhutdinova, A M
Colonoscopy-based colorectal cancer modeling in mice with CRISPRCas9 genome editing and organoid transplantation