Dr. Shultz addressed this question on one of his free videos I watched, it was some time ago, but he said this yeast is not a bad yeast like bread yeast ect. and is not even harmful to candida patients. I can vouch for that, as I have had extreme candida problems, but the superfood never had any adverse effects with my condition. If I recall correctly (it was sometime ago) I even drank superfood while I was on the candida diet, which eliminated everything but meat, certain vegatables and fruits. I feel the superfood would be a great health benefit for your patient, and thousands of Dr. Shultz's patients have healed themselves of cancers, Aids, ect. while using the Superfood faithfully. Hope this helps a little, Caitlin Lorraine