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Family history of B12 deficiency Symptoms of Vitamin B12 Deficiency Early signs include: Weakness and fatigue Numbness or tingling in extremities Difficulty walking or elevated heart rate Smooth, tender tongue Nausea , loss of appetite, weight loss Irritability, diarrhea More Severe Symptoms: Tinnitus (ringing in the ears) Severe joint pain Memory problems or cognitive decline Depression , anxiety, or irritability Poor muscle function , ataxia (lack of coordination) Infertility Delayed growth or development in children The Benefits of Vitamin B12 Injections B12 injections are often used for severe deficiencies to restore B12 levels quickly

It is also available in supplement form

you're just increasing dose of compounds already present

(Innopeptides) Key Limitations, Risks & Unanswered Questions As promising as FOXO4-DRI is, there are important caveats

Frontiers in Nutrition, 7, 606398