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Several factors can lead to elevated B12 levels, including: Over-supplementation: The excessive intake of vitamin B12 through high-dose oral supplements or repeated intramuscular injections can raise blood levels of B12 temporarily 6

Prenatal vitamin B12 status and cognitive functioning in children at 4 years of age: The ECLIPSES Study. Maternal & Child Nutrition 20.1 (2024): e13580.

However, a deficiency might indicate more serious health issues and is usually accompanied by mild side effects such as diarrhea and headaches

Vitamin B12 is a nutrient that helps keep the body's nerve and blood cells healthy