Waypoint will do samples from Kansas. You just ship it to their site. Pick from their sites which one does the test you want. USPS small box and fill out their form.
I dont fully trust the "optimal" in any chart. For sure you want to be above deficient, but optimal is subjective.
Two other labs Brookside and Midwest
I dont fully trust the "optimal" in any chart. For sure you want to be above deficient, but optimal is subjective.
Two other labs Brookside and Midwest