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If you are living with an MTHFR mutation, are vegetarian/vegan, or are susceptible to vitamin B12 deficiency for other reasons, you now have more tools in your tool box for understanding and dealing with vitamin B12 deficiencies
Even if a substance isnt formally banned, sideeffect risk is what users actually care about
Sublingual and nasal B12 sublingual tablets (dissolved under the tongue) and nasal B12 sprays have shown effectiveness for deficiency correction as needle-free alternatives but only when the gut absorption mechanism is intact
Aging can contribute to decreased absorption of this crucial vitamin, making monitoring even more essential
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