I get my cure mix from a buddy. He buys the ingredients in bulk and separates them by weight. He gives me bags of it, but won't tell what's in it. It works.
Lot of individuals use various items to spruce up bait or add when they milk up to be absorbed into the eggs.
Ex. Brown Sugar, sodium sulfite, white sugar, sodium bisulfide, anise oil, slam-ola powder, sardine, shrimp, DMSO, garlic, Noniodized salt, cherry flavored kook-aid, borax, quick cure, tuna scent, pro cure, pro glow, TNT cure, Amermans Egg Cure, honey, various bait colors. You name it and I've tried it over the years.
Some eggs fish well with certain scents lower in the river and require different additives the longer they have been in fresh water. Just don't buy the vacuum packed bags of roe you see. Spend the money to get good eggs or cure eggs right away. When I would catch a hen, I would cut the eggs out right away and throw them in a bag and place in a cooler.