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B12 has no riboflavin (B2.) B Complex or super B is what you need. It has riboflavin and all other B’s. B12 only has B12 and no other B vitamins. Riboflavin is important for leg health in chickens.

You ought to use B complex vitamins which has all the b’s including riboflavin. Mareks can be diagnosed usually with a necropsy after death, but some labs will do a pcr test for Mareks with a small blood sample. If you have any pictures that may help.