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Side Effects and Precautions Known Risks (Animal Studies + Anecdotal Reports) Potential for over-stimulation of neurogenesis , which is beneficial short-term but may carry unknown long-term risks Some users report: Mild headaches Irritability or emotional blunting Temporary insomnia if taken late in the day Theoretical Risk: Tumor Growth
This leaflet was published by Guts UK in 2023 and will be reviewed in 2025
Because B12 is water-soluble, your body uses what it needs for immediate metabolic tasks and stores a portion in the liver
Vitamin B12 shots may help reduce the risk of the following conditions: neurological disorders problems with thinking and memory vision loss infertility neural tube defects in children born to those with a vitamin B12 deficiency There is no upper limit for the intake of vitamin B12 because the risk of toxicity or overdose is low
There is a low risk of serious side effects when administered by a qualified professional
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