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Folate is a water-soluble vitamin, which means you need it in your diet every day because it can't be stored in the body. Most people should be able to get the amount they need by eating a varied and balanced diet. Adults need 0.2 mg a day. However, if you are pregnant or thinking of having a baby you should take a daily 0.4 mg (400 microgram) folic acid supplement from the time you stop using contraception until the 12th week of pregnancy. This is to help prevent neural tube defects such as spina bifida. If you have already had a pregnancy affected by a neural tube defect, a higher dose is recommended. Speak to your GP for more advice.
Folate has a number of important functions. For example it:
Unless you are pregnant or thinking of having a baby, you should be able to get all the folate you need by eating a varied and balanced diet. If you're taking folic acid supplements, it's important not to take too much because this could be harmful. Taking 1 mg (1000 micrograms) or less of folic acid supplements a day is unlikely to cause any harm.
If you're not getting enough vitamin B12 - known as vitamin B12 deficiency - taking doses of folic acid higher than 1 mg can hide this fact. An early symptom of vitamin B12 deficiency is anaemia. But taking large amounts of folic acid treats the anaemia without treating the B12 deficiency. If vitamin B12 deficiency isn't noticed, it can eventually lead to damage of the nervous system (neurological damage). This is a concern particularly for older people, because as we get older it becomes more difficult to absorb vitamin B12.