DOI: 10.1007/s11095-009-0045-6 DailyMed
10.1016/j.ccr.2008.02.011 232 ZhangQ.WuH.ZouM.LiL.LiQ.SunC.et al (2019)
You can adjust concentrations and add other beneficial ingredients like rosemary oil or apple extract for added benefits
Intravenous methods offer much faster absorption and quicker, more noticeable clinical benefits
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Serious problems can begin to arise with only a slight B12 deficiency