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The 2025 IV safety study tolerated doses up to 20 mg IV in two healthy volunteers without adverse events the highest-quality published human safety data
Insulin resistance and inflammation, linked with obesity, also appear to reduce sperm motility and increase DNA fragmentation in sperm cells
Since vitamin B12 is found in animal products (meat and dairy), vegans and vegetarians may have a deficiency
Low levels are linked with brain fog and low mood
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