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Apply serum directly to the scalp, not to hair shafts

While research is still limited on the link between vitamin B12 and weight gain, most evidence suggests that the vitamin itself wont cause you to put on pounds, but a deficiency may

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The tissue under the tongue is highly vascular, with direct access to systemic circulation

Wakabayashi T, Yamaguchi K, Matsui K, Sano T, Kubota T, Hashimoto T, Mano A, Yamada K, Matsuo Y, Kubota N, Kadowaki T, Iwatsubo T (2019) Differential effects of diet- and genetically-induced brain insulin resistance on amyloid pathology in a mouse model of Alzheimers disease