This is what the net says: Although a folic acid overdose is not likely to be dangerous, taking high doses of the vitamin long-term can cause digestive problems, zinc deficiency, and problems sleeping. High doses of folic acid can also "mask" a vitamin B12 deficiency or increase the risk of heart attacks in people with heart disease. Treatment for a folic acid overdose will generally involve supportive care.
Please read more on: https://www.drugs.com/folic_acid.html, hope its of help?
- Folic Acid Information for Consumers
- Folic Acid Information for Healthcare Professionals (includes dosage details)
- Side Effects of Folic Acid (detailed)
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