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Other antioxidants like vitamin C or E dont bind NO with the same affinity, so they dont suppress enteric nervous system signaling to the same degree

USDA Organic Respiratory Health Liquid Drops: If your respiratory system is occasionally irritated by dry air or other minor nuisances, reach for this blend of Mullein Leaf (Verbascum thapsus) and Marshmallow Root (Althaea officinalis) to soothe and support - keeping your respiratory system happy and healthy Mullein Leaf Blend: The respiratory system is a system of great importance in our overall health

PepPal's featured source: Peptira Peptira sells a 10 mL BAC water product and provides a View Test Results link from the product page

In the case of a documented deficiency, a monthly regimen may be required