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Unlike other vitamins, the absorption of vitamin B12 depends on a protein produced in the stomach called intrinsic factor
A riboswitch regulates expression of the coenzyme B12-independent methionine synthase in Mycobacterium tuberculosis: implications for differential methionine synthase function in strains H37Rv and CDC1551
Fecal metagenomic profiles in subgroups of patients with myalgic encephalomyelitis/chronic fatigue syndrome
Stress, aging, and environment degrade those signals over time
(We recommend this over the extra strength blend, which is more than twice the price for less than 200mg more of the proprietary nootropic blend.) Focus Factors nootropic centers around DMAE, an antioxidant and free radical destroying ingredient, but the formula also includes some of the same herbs and extracts in Alpha BRAIN (such as B6, huperzine A, and Bacopa monnieri extract)