It makes sense given that MCAS is at the root of chronic Lyme Disease symptoms. D3 has a myriad of therapeutic properties because of the various functions it performs in the body. In the 5 years I’ve taken D3 prophylactically I haven’t come down with the flu once. Before that? I’d get sick every single year. Our organism is better at healing itself than we think, we just have to provide it with the nutrients it needs to do so!