Amino Acids - Cysteine or Cystine - Contraindications / Precautions / Warnings

It is not recommended to take a single amino acid for an extended period of time without supplementing with other amino acids as well. Long-term isolated amino acid supplementation can create an imbalance in the body.

Diabetics should take caution when supplementing with cysteine, as it can interfere with and inactivate insulin.

Do not supplement with cysteine if you are susceptible to cystine kidney stones.

NAC capsules have a strong smell, but generally do not cause bad breath or stomach upset.