Vitamin B Complex Supplement Side Effects

Vitamin B ComplexVitamin B Complex supplements are a collection of the eight B-vitamins that play an important role in cellular metabolism of your body. The eight B complex vitamins are Thiamin (B1), Riboflavin (B2), Niacin ( B3), Pantothenic Acid (B5), Pyridoxine( B6), Biotin( B7), Folic Acid( B9), Cobalamins (B12). You consume these supplements in order to derive energy from the food you consume, to ensure proper functioning of your nervous system, synthesis of enzymes and hormones, cell division, and neurotransmission. Pregnant women take B complex supplements to ensure proper growth and development of the fetus.

B complex vitamins can be obtained from natural sources by consuming a diet rich in these vitamins. However, as it is not often possible for many to find all the eight B-complex vitamins in the food that they consume daily, they use vitamin supplements to make up for the B vitamins deficiency from natural sources.  However, these supplements do cause side effects when they result in vitamin toxicity due to over dosage. Before consumption of these vitamins, you must consult a registered physician about the daily recommended dosage of these vitamins for your health status.

Side Effects Of Vitamin B Complex Supplements

Thiamine (B1) Side Effects


Thiamine is important for energy generation from carbohydrates, gene production and nerve functioning. Side effects of this vitamin include itchiness, rashes, and hives, which are allergic reactions. Over-dosage reactions include restlessness, fluid retention, sweating, nausea and weakness.

Riboflavin (B2) Side Effects

Mainly involved in the generation of important biochemical processes of the body such as electron transport chain, citric acid cycle and fatty acid catabolism, an overdose of this vitamin can result in frequent micturition and diarrhea.

Niacin Side (B3) Side Effects

A vital component of bio-energy transfer reactions and metabolism of fat, glucose and alcohol, this vitamin can cause flushing of the skin when present in excess amounts in the body.


Other reactions include chills, sweating, nausea, stomach upset, heartburn, dizziness, abdominal pain, blurred vision, joint pain, swelling of body parts, yellow eyes, and black stools.

Pantothenic Acid (B5) Side Effects

Involved in the oxidation of carbohydrates and fatty acids, and production of essential organic acids, enzymes and hormones, Pantothenic Acid does not usually exhibit any side effects, other than diarrhea.

Pyridoxine (B6) Side Effects

Involved in the lipid and amino acid metabolism, glucogenesis, and synthesis of hemoglobin and neurotransmitters, when present in excess quantities in your body, it will cause drowsiness, tingling sensation, nausea, vomiting, headache and loss of appetite.


In very high quantities, this vitamin can also cause neurological and nervous problems. Disorientation, numbness and extreme fatigue are some of the other symptoms that can be caused by Pyridoxine toxicity. However, the higher degree reactions are not very common.

Biotin (B7) Side Effects


An important component of bio-compounds involved in the metabolism of macronutrients and bio intermediary products and glucogenesis, Biotin is not known to cause toxicity, except in pregnancy, when it results in the shrinkage of the placenta potentially leading to fetal issues or a miscarriage.

Folic Acid (B9) Side Effects

Folic Acid is involved in cell division and erythropoiesis(synthesis of red blood cells) in the body. It does not generally cause any side effect but an increased dosage is associated with the risk of prostrate cancer, liver cancer and heart attack.

Cyanocobalamin (B12) Side Effect


Involved in the metabolism of macronutrients and synthesis of blood cells in the bone marrow, Cyanocobalamin causes diarrhea, itching, and blood clots as side effects when present in excess levels in the body.

Caution: Please use Home Remedies after Proper Research and Guidance. You accept that you are following any advice at your own risk and will properly research or consult healthcare professional.