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People with normal liver function store 50% of their vitamin B12 in their liver, so if your liver is not functioning properly, you may need more vitamin B12 shots than those whose livers are working as designed

Biopharm Drug Dispos 33(9):550559 Rai SN, Singh P, Varshney R, Chaturvedi VK, Vamanu E, Singh M et al (2021) Promising drug targets and associated therapeutic interventions in Parkinsons disease
Influencers have amplified the idea that microdosing can be done by anyone, even people who are already at a normal weight

In Residue Reviews: Residues of Pesticides and Other Contaminants in the Total Environment , 1728, (Springer, 1983)

The BDNF Val66Met polymorphism Not everyone starts with the same BDNF potential

Vitamin B12 plays a big role in the production of tryptophan, so if your B12 levels are low, your sleep may be more restless
