Not intended for use by persons under the age of 18. Beta-Alanine may cause a harmless, temporary tingling sensation on the skin for some individuals. After a few weeks of supplementation with Beta-Alanine, this sensation normal lessens or subsides. If you are pregnant or nursing, taking any medication, or have any medical condition, consult your doctor before use. Discontinue use and consult your doctor if any adverse reactions occur.