is b12 injection over the counter Injectable Vitamin | OTC B12 Shots Cyanocobalamin (B12) Injection 1000 mcg/mL,

Oral B12 cannot get into the bloodstream in normal doses

However, with the current environments we live in and the poor quality and mass production of food, especially animal products at the moment, everyone is at risk of having below sufficient levels of Vitmain B12

Vitamin B12 - Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline - NCBI Bookshelf

Elevated B12 Symptoms: Signs of Too Much Vitamin B12 While rare, excessive B12 intake can lead to certain symptoms: Acne or rosacea Headaches Nausea and vomiting Diarrhea Fatigue Tingling in hands and feet It's crucial to note that these symptoms can also be caused by other conditions, so always consult a healthcare professional for proper diagnosis

[2] For this reason, elevated serum homocysteine over 15 micromol/L and methylmalonic acid (MMA) over 0.271 micromol/L are considered better indicators of B 12 deficiency, rather than relying only on the concentration of B 12 in blood

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