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This last factoid suggests it likely wouldnt work as well in younger patients who already have maximally sensitive HGH receptors on their cells

[1] Without intrinsic factor, dietary B12 cannot be absorbed effectively, leading to deficiency regardless of dietary intake

However, if left untreated, it can progress and cause: Chronic fatigue and overall weakness Dizziness Pale or yellowish skin tone Mental health problems such as depression, mood swings, irritability, and anxiety Loss of appetite, nausea, and diarrhea, leading to weigh loss Paresthesia: numbness, tingling or burning sensation in feet, legs, and hands Vision problems Vitamin B12 is an essential nutrient, meaning everyone should get it either from food or supplements

Syringes come in three main sizes