A 2015 study published in the Journal of the International Society of Sports Nutrition looked at the effects of L-citrulline + GSH supplementation on NO levels 4
This method allows for faster absorption compared to oral supplements and is often used to enhance the bodys antioxidant defences
If you have a known sulfur intolerance, it is crucial to work closely with a knowledgeable healthcare provider to determine if direct glutathione supplementation is appropriate, or if alternative antioxidant support strategies should be utilized

This convenient, shelf-stable glutathione supplement boasts 2.5x better bioavailability than the leading competitor.* It works better, faster, and goes deeper to help maintain a healthy immune system, soothe the digestive tract, and help the mind to think clearly.* Provail ingredient is an all-new glutathione delivery system that is revolutionizing the supplement industry: an ultra-small whey protein matrix, Provail ingredient is a coated glutathione that helps protect it from the harsh conditions of the gastrointestinal tract.* Only when Provail ingredient arrives in the small intestine does it release the Provail glutathione for maximum absorption and peak impact.* Studies showed that Provail ingredient was absorbed 2.5x better, raised blood and tissue levels of glutathione, and boosted blood antioxidant activity more than the leading glutathione brand.* Provail ingredient technology is available exclusively from DaVinci

This effect may not be desirable for those with naturally curly or wavy hair