Vitamins - B-Complex - Contraindications / Precautions / Warnings

If you have liver disorder, gout, or high blood pressure, you should consult with your naturopath or health practitioner before taking a B-complex vitamin. Niacin/B₃ has a dilating effect on blood vessels and may cause problems in the above situations.

Do not take any individual B vitamins in high doses without first consulting with your naturopath or other health practitioner.

Also, do not be alarmed if you experience a "niacin flush" -- a dilation of blood vessels resulting in redness and tingling around joints, certain muscles and other portions of your body, and increased warmth. Depending on dosage, the effect can last from several minutes to one hour. The effect is completely normal, though you may be caught off guard at first -- especially if you do not know it is coming.