Most industrial hard (high-temperature) silver solder contains cadmium. More of a problem, you can't tell what is in the solder by looking at it.
I buy some welded icing tips from Korea that have been nickel-plated because I can have my local lab check their surface. But there have been too many lead and cadmium castings shipped to North America as cereal-box toys.
If I still had a TIG welder in the house, I would go into business making and selling certified stainless steel cake-baking nails. I believe that is the kind of initiative it would take for people to be very sure of the food safety aspect.