You have to remember that you can never be sure of the potency, purity, dissolution and bio-availability of the the Food Grade product you buy off the shelf, therefore in as a marketing strategy if you use more of the product up front (e.g..Loading doses") then you'll need to buy your next month's supply two weeks early. And the double dose may be required in order for you to even get close to the recommended single doses level that your body can use because the product has problems in meeting potency, or it's not bio-availability is not up to the body using he product.
Any pharmaceutical grade product will have earned that USP certification because it's meets measurable standards for potency, purity (free of toxins), dissolution and bio-availability,...and,...you will not see loading doses on the label.
