It refers to how fast a substance (CBD) gets to the bloodstream and how long the effects take to manifest. While the makers of skin-related CBD products often trumpet the fact that the skin is the body’s largest organ (and thus the perfect medium for delivering CBD), there’s a reason the Food and Drug Administration (FDA) didn’t include infused cosmetics and lifestyle products like bed sheets on their list of CBD-related concerns: unless a product has transdermal capacities, the…