The skincare you can and can't use during pregnancy Guides I absolutely love NAC (N Acetyl Cysteine) for so many reasons! Not only is it fantastic for upper respiratory issues, but it also plays a crucial role in promoting glutathione, which is Your Definitive Guide to Pregnancy Safe Skincare Marie Claire Glutathione S transferases and their implications in the lung diseases asthma and chronic obstructive pulmonary disease: Early life susceptibility? ScienceDirect