When supplements of any sort are taken orally, they have to be processed by the GI tract which will lower the effective concentration
Mawson JT, Braun B, Rock PB, et al
Dosing & Reconstitution Guide Educational guide for reconstitution and common dosing patterns Standard / Conservative Approach (3 mL = 33.33 mg/mL
[Controversial contraception: immunization against hCG] [PMID: 8710014] Laboratory literature summary: [Controversial contraception: immunization against hCG]
Biochem Biophys Acta 1853:15131527 Qi W, Li J, Chain CY, Pasquevich GA, Pasquevich AF, Cowan JA (2013) Glutathione-complexed iron-sulfur clusters
Methylcobalamin and adenosylcobalamin both occur naturally in food and work together in our bodies to provide adequate vitamin B12 intake for bodily function