Yes. Every KOS batch is tested for a full spectrum of contaminants including heavy metals and we will never release a batch that contains higher than the normal levels (above what is normally found in the plant ingredients).
KOS protein is made from organic plants that are grown in mineral-rich soils. Organic fruits and vegetables naturally absorb trace metals and the closer to the soil and the more water-loving a plant, the more it takes in. If you eat whole foods like fruits, rice, kale, spinach, and hundreds of others, you're already consuming perfectly safe and acceptable levels of trace metals.
Nearly every ingredient in KOS protein is certified by both the USDA and CCOF and our formula is made here in sunny Southern California in a NSF/GMP certified clean environment.