Luckily, California has very stringent standards around heavy metals. There are lots of brands of collagen that don't require prop65 warnings on the bottle (and

Luckily, California has very stringent standards around heavy metals. There are lots of brands of collagen that don't require prop65 warnings on the bottle (and that are legally sold in California). California's standards are stricter than industry and national standards, to the point where you're probably fine even if a product does require a prop65 warning