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Variations in the MTHFR gene can affect how the body metabolises B vitamins, including B12

The other option youll find in pharmacies will have methylcobalamin as the active ingredient

Non response to B12 injections should therefore necessitate re-evaluation and consideration of other diagnoses

However, with severe vitamin B12 deficiency or absorption issues, healthcare professionals may recommend an intramuscular injection rather than an oral supplement

This includes people who dont get enough sun, older people whose bodies are unable to produce as much Vitamin D, and people with darker complexions, whose skin is more resistant to the suns UV rays