B12 is safe on its own, but a few conditions call for extra care, which is why a provider reviews your history before treatment: Leber's hereditary optic neuropathy, a rare inherited eye condition, where certain forms of B12 may be a concern for the optic nerve
Micronutrients: Vitamin C (cofactor for collagen synthesis), vitamin D and calcium (bone mineralization), zinc (enzyme cofactor in healing), omega-3 fatty acids (anti-inflammatory)
Combining this with a PDE-5 medication (Viagra, Cialis) may be a successful combination, but should only be done when your medical provider is aware of your condition and medication use
Consider supplementation when the patient has risk factors associated with B 12 Deficiency as described in see Table 1: Patient Risk Factors Associated with B 12 Deficiency above
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Though these are a normal part of human metabolism, they cause significant oxidative stress over time, damaging DNA inside cells and leading to premature aging