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Most recently, the FDA released guidance that they did not find safety concerns in their initial review, but that they have not yet reached a final decision relating to an alternative request to allow the use of NAC in dietary supplements
Patients require regular monitoring of thyroid function tests to ensure the correct dosage, and adjustment may be needed over time due to factors such as aging, pregnancy, and changes in other health conditions
A balance is needed because, at high doses of 500-600 mg, caffeine can increase heart rate and shivering[9 Trusted Source 2015 - Current neuropharmacology Caffeine: Cognitive and Physical Performance Enhancer or Psychoactive Drug
Its a mixed bag approach, Arias says of strategies for entering the market
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