We can reassure you that these are safe and effective sources and materials. There need not be absolute purity, just as with the normal diet there will be many deleterious substances ingested inadvertently. This is well-known from the concentration of toxins as a consequence of the interaction of species in the web of life, particularly by predatory species ingesting many other life forms and potentially accumulating the dangers they might harbor. So while perfection is not possible, there is no benefit in dwelling on potential risks as long as you can use common sense and due diligence in learning what you can about strategies and methods used in those things you take into the body. If this is possible, you are doing the best you can. Even under circumstances where contaminants are present, the benefits of taking the preventive substances will outweigh the dangers. So, in other words, there is a danger in being overcautious if it keeps you from taking a lifesaving nutritional substance simply because there might be contaminants. The body is designed to recognize and process such things and to sequester what it cannot degrade safely. That is not a perfect system, but you need to stay safe and healthy in order to have such a long-term potential threat build to a dangerous level. Staying healthy is more important than being pristine in your intake.
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