Vitamin B12 plays an indispensable role in several vital biological processes: Nervous System: It is essential for the synthesis of myelin, the protective sheath around nerve fibres
neuropathy), effective replacement therapy should lead to a normal full blood count and B12 level after 8 weeks of treatment, while improvement in neurological symptoms begins very quickly within one week of initiation of therapy but can take up to 3 months to resolve (Carmel, 2008)
The follicle effects described in the 2007 study (PMID 17703734) operate over the growth phase, which is far longer than four weeks, so visible density or thickness changes this early aren't predicted by the biology
Prevention of Folate Deficiency It is recommended that all people who could become pregnant take a daily supplement containing 400 mcg/0.4mg folic acid to reduce the risk of neural tube defects (NTDs)
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Some protocols call for a one-month break every two months of use