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It can also result in pernicious anemia which occurs when your body does not have enough vitamin B12 to produce the required amount of red blood cells
Symptoms from oral supplementation alone are exceedingly rare because the body absorbs so little at high doses
Decreased lipid synthesis in livers of mice with disrupted site-1 protease gene
Sun, H., Yang, T., Li, Q., Zhu, Z., Wang, L., Bai, G., & Wang, W
You might be unknowingly blocking B12 absorption
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