A scoop is a dose, and it is wrong
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Every other decision in this property is downstream of one uncomfortable fact: the scoop in the tub is the measuring instrument for a dose, and it is not a measuring instrument.
The number that should worry you
Scoop accuracy has been measured across several powders, nicotine bitartrate, tyrosine hydrochloride, bacopa extract, and the error rates ran from plus or minus 18 percent to nearly plus or minus 40 percent.
Forty percent. On a product whose entire proposition is that it delivers a stated amount of something. A customer taking what they believe is a 5 g serving may be taking 3 g or 7 g, and neither they nor you would know.
Why a scoop cannot be accurate
A scoop measures volume and the label declares weight. The conversion between them is bulk density, and bulk density moves constantly: with particle size, with how much the powder has settled in transit, with how compacted it is at the bottom of a tub versus the top, and with moisture uptake.
Then there is technique. Scooped level, heaped or tamped are three different masses from the same scoop, and no instruction on a tub reliably produces one of them.
And the powder changes as the tub empties. The first scoop out of a freshly opened tub and the last scoop from a settled one are not the same serving.
What the regulation actually says
Serving size must be expressed in a term appropriate to the form of the supplement, the regulation gives examples such as tablets, capsules, packets and teaspoonfuls.
Which is worth noticing: the regulatory vocabulary reaches for a household measure rather than a proprietary one. A scoop is a convenience you supply, not a defined unit, and declaring a serving in grams alongside it is what makes the claim verifiable.
What to do about it
Declare the serving in grams as well as in scoops. Calibrate the scoop against your actual finished powder rather than against a supplier's nominal capacity, and re-check it whenever the formula or the grind changes.
Specify the technique in the directions: level, not heaped. And where the product is potent enough that a 40 percent error matters, tell people to weigh it, because that is the honest answer and some customers will.
Formats a scoop actually works in
