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It's also important to remember that if you have Leber's disease, a specific type of B12 called cyanocobalamin could be harmful to your optic nerve

Severe deficiency: For severe cases, more doses or injections might be needed, even if there are neurological symptoms

That structural narrowness is the entire premise behind AOD-9604 as a research compound: a peptide that retains one specific signaling function of growth hormone without carrying its broader hormonal footprint

This is certainly not a good sign

Three RCTs met inclusion criteria The trials randomized 153 participants (74 participants to oral vitamin B12 and 79 participants to IM vitamin B 12 )