Signs of excessive folate include low blood pressure, lower blood sugar levels, bloating, breathing difficulty and a bitter taste in the mouth, according to Mayo Clinic. People who consume too much folate may also experience dizziness, fatigue, diarrhea, cramps and headaches. Folate in excess can cause confusion, hair loss, impaired judgment, inflammation and lung muscle spasms.
Individuals who have consumed too much folate may experience mood swings, psychotic behavior, vivid dreams, sleep problems and weight changes, warns Mayo Clinic. Skin irritations such as itching, redness, a rash, hives or flushing can also develop. Some people who have excess folate in their system suffer from blood flow problems that are caused by narrowed vessels, changes in urine color, hair loss and nausea.
Excess amounts of folate put people at risk for increased seizure frequency, asthma and cancer, according to Mayo Clinic. Folate herbs and supplements should not be consumed by people who are taking vitamin B after heart surgery or individuals who take anti-cancer agents or folic acid blockers unless recommended by a medical professional. Folate should be used cautiously when combining with daily doses of aspirin. People with anemia, lung disorders, nervous system disorders, skin conditions, and seizure and stomach problems should use the supplement cautiously and under the care of a physician.