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Unlike oral supplements, which rely on your digestive system to absorb the vitamin, B12 injections deliver the nutrient directly into your bloodstream
Animal studies and small clinical trials indicate possible mechanisms, but no large rigorous trials exist to confirm safety and efficacy for fertility
Increased risk of prostate cancer
Common Reasons for High Vitamin B12 Levels Here are some reasons for high vitamin B12 levels: 1
Effective concentrations in studies range from 1 to 20 parts per million (ppm), or approximately 0.0001% to 0.002%
Habeeb and Abdulkadhim, 2024
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