(This amount is about 100 times higher than the RDA due to the fact that only about 1% of ingested B12 from supplements is absorbed.) All vegans should take 250 mcg per day of a B12 supplement
Such a risk was confirmed by a meta-analysis recruiting 26 published studies which showed an association between MTHFR C677T polymorphism and increased risk of depression 73
Other signal transduction systems and metabolic pathways involved in the MGB-based cause of depression include the endocannabinoid system, CAMKII-CREB and MAPK signaling, and glycerophospholipid metabolism
doi: 10.1016/j.intimp.2018.01.015 93
I have also accessed other sites for my B12 injections, including, the upper arm (deltoid), thigh (vastus lateralis), and the buttocks (dorsogluteal)
protein rich foods, including common Philippine food choices like fish, eggs, and legumes, support glutathione intake