And do your own trials using the methods you will find there. If you need to use a colorant glaze whose susceptibility to toxic leaching you don't know, have a test done. See Monona's many posts to find out what and how to do it. All of the experts have said over and over that good fit and safety do not come from trusting others and received recipes. They come from checking and rechecking, and matching glaze to body.
Commercial glazes are expensive, and they are matched to an ideal body.
For that reason, if for no other, take Tony Hansen's advice, and stick to a basic glaze for each body, and keep up with changes in each batch. Then you will know. Some glaze toxins can be transported in the kiln by diffusion and by fumes. Lead and other low temperature melting point materials are the highest risks, but there are other rare and fascinating circumstances, no doubt. They can also be spread by dusts, errors and pot contamination while mixing.