I don't know....my father-in-law suffered for a year with his Sjogren's disease, before his homeopath told him about Miracle-Mineral-Supplement . Sjogren's is an autoimmune disorder, and he has had a second lease on life because of the improvement in his health since taking the Miracle-Mineral-Supplement 2 years ago. The Sjogren's Society of Canada tells it's members that there is no cure for this debilitating condition, yet Dad has become once again the vibrant 70-something man we all loved from changing only one thing in his regimen - starting Miracle-Mineral-Supplement . Before that, he had no energy, was sleeping poorly, and had dry mouth/eyes - he had to drink water just to get food down and used artificial tears at least 6 times a day. All those symptoms are now gone. That would indicate his immune system has improved, and his body is now functioning how it should.