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 normally lessens or subsides. Not for use by individuals under the age of 18. If you are pregnant or nursing, taking any medications, or have any medical condition, consult your physician prior to using this product. Do not exceed recommended use. Improper use will not improve results.