From the Wiki page for Trevor Marshall:
Trevor G. Marshall, PhD (b. 1948, Adelaide, South Australia), is a biomedical researcher. Over the last few years, he has developed a medical treatment, called the 'Marshall Protocol', which uses low-dose antibiotics, an angiotensin II receptor antagonist (being used as a VDR agonist, and avoidance of Vitamin D, to treat a class of chronic diseases, which he argues are caused by L-form or cell wall deficient bacteria. His protocol is being used by physicians worldwide to treat a variety of chronic diseases. Waterhouse reported these include include Sarcoidosis, Fibromyalgia, and rheumatoid arthritis.Marshall first began to suspect Vitamin D when he noticed that his condition got worse with more sunlight. Notice that his Marshall Protocol includes Vitamin D avoidance.
One of the finest friends of my life, a woman named Linda, died of Lupus, another autoimmune disease. She too reacted negatively to sunlight, as is typical with Lupus victims.
sarcoidosis ping