The Best Foods To Boost Your Body's "Master Antioxidant" 7 Ways to Up Your Glutathione Levels by Timeless Health Clinic Issuu What if we told you one serving of Ontario asparagus has only 20 calories (per 1 2 cup) but still brings major nutritional value including: Folate Vitamins A + K Asparagus season is here and it's fleeting so let's make the most of it! But first, did you know that asparagus is a rich source of our body's master antioxidant, glutathione,