B6/Pyridoxine:

Frydas S, et al.   IgG, IgG1 and IgM response in Trichinella spiralis-infected mice treated with 4-deoxypirydoxine or fed a Vitamin B6-deficient diet. Mol Cell Biochem. 1999 Apr;194(1-2):47-52. PMID: 10391123; UI: 99318007.

Dobbelstein H, et al.  [Immunsuppression under vitamin B6 deficiency]. Res Exp Med (Berl). 1977 Jan 28;169(3):189-202. German. PMID: 320637; UI: 77126725.