Vitamins make yeasts healthier, promote survival, help avoid stuck ferments, and are useful in preventing sulfides. Nitrogen-deficient musts produce H2S because of interruption in amino acid synthesis, but research now shows that if there is enough nitrogen but a deficiency of pantothenate, MORE and WORSE-SMELLING sulfides form. Vitamix® is pure vitamins for yeast. Testing vitamins in juice is quite expensive and takes weeks, so adding a vitamin blend can be good “insurance".