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In lyophilized (powder) form, store in freezer for up to 2 years
If you dont notice any improvement and you were not deficient to begin with, it could mean your vitamin levels were adequate and the injection is simply maintaining that status
After years of research, it has now been shown that a deficiency of the vitamin leads to an increase in myelin-damaging cytokines and a decrease in myelin-promoting cytokines (34)
Theres no studies yet to show why this may be - whether its the effect from intense cardio or whether those who enjoy running more commonly have a naturally higher metabolism - and it doesnt seem to happen for all runners
Evidence reviews for risk factors and symptoms and signs for vitamin B12 deficiency: Vitamin B12 deficiency in over 16s: diagnosis and management: Evidence review B
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