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Nevertheless, the human free BDNF Quantikine ELISA kit (#DBD00, R&D Systems) showed the best specificity and may serve as a suitable option for estimating serum mBDNF levels

MTHFR , MTR , and MTRR sit in the methylation pathway that B12 feeds into

Dont use thin plastic (e.g., water/soda bottles) or anything that can be punctured easily

H.et al (2013)

That is the wrong outcome

Amount of vitamin b12 that reaches blood: Vitamin B12 Injection For Dogs Delivers Larger Amount Of Cobalamin In Blood-Picture Courtesy: MetLife Pet Insurance By giving vitamin b12 orally, you cannot estimate what amount of nutrient that has reached the blood