There is a "background level" of lead in many products.

So I think if you have been using psyllium fiber regularly for a long time, getting a blood test is reasonable.

It is interesting that they tested the products and not the people using them - sometimes elements are "bound" to the products we use, and are not absorbed - just pass through.

Remember, lead is present in many other things - foods, supplements, soil, water and air. For example, when urban soils are tested before community gardens are planted, it is sometimes determined there is too much lead, arsenic and other contaminants to safely use the space for food production without remediation.