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Clinical-grade runs $250 to $450 monthly

The GP thinks that my depression could have been from B12 deficiency (I have a few other symptoms from the deficiency also) but because my levels were never checked before now, we can only wait to see how things change as my levels go up

In the present paper, vitamin B 12 concentrations are presented as pg/mL (as often used in clinical practice), whereas in some papers cited in discussion pmol/L are used (1 pg/mL = 0.7378 pmol/L) [1]

The preferred site for most researchers due to consistent absorption and easy access

Environmental Science & Technology, 876: 162342 Burket S R, Wright M V, Baker L F, Chambliss C K, King R S, Matson C W, Brooks B W (2020)