What Is Glutathione?: Clover Internal Medicine Associates: Board Certified Internal Medicine Glutathione Deficiency Symptoms: Is Poor Sleep Just the Beginning? Cardiology & Neurology Specialists located in Queens, Forest Hills and Brighton Beach, Brooklyn, NY Advanced Medical Care Iron supplements are often paired with vitamin C based on the idea that vitamin C improves iron absorption. But how well does the evidence support this claim? As part of a Understanding how to take supplements correctly can greatly enhance their effectiveness:, 1. Glutathione: For optimal absorption, take glutathione on an empty stomach. Pair it with vitamin C, as this