Folison is used to prevent and treat low folate levels in the blood (folate deficiency) and excessive homocysteine levels in the blood (hyperhomocysteinemia). Pregnant or planning to become pregnant women should take folic acid to avoid significant birth abnormalities such as spina bifida. Folison is also used to treat a variety of different illnesses, including depression, stroke, memory and thinking abilities deterioration, and many more. Folic acid is a kind of vitamin B9 that is used to treat deficiency and avoid pregnancy problems. Several foods contain or have folic acid added to them.