As in vit D3 deficiency and related GcMAF (macrophage activating factor)? Something called nagalase is an enzyme that destroys GcMAF and is present on many viruses. Don't know if present with Covid-19 - still looking. A search turned up a mention of this with immediate post trying to discrediting the idea which makes me think it might work. Needs more expert opinion than this anon. More on nagalase and GcMAF at qresear.ch