supplements of selenium of 200 g/d (as selenium yeast or selenomethionine), generally considered to be safe, have been associated with toxic effects (alopecia, dermatitis, squamous cell carcinoma, type-2 diabetes mellitus, high-grade prostate cancer) in North Americans ( Reference Lippman, Klein and Goodman 106 Reference Stranges, Marshall and Natarajan 108 )
John Davenport (2001) Strong Muscles, Strong Tumors
Retesting B12 blood serum levels to verify they are increasing as expected
Any cloudiness, particles, discoloration, or unusual viscosity indicates potential problems
Limited head-to-head trials exist
Among the participants, 1,320 had pre-diabetes at the start of the study, defined by blood sugar levels between 5.7%-6.4%