Net quantity and feeding directions
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Net quantity
A declaration of how much is in the container. For a dry supplement that is a weight, and weight is what the fill should be controlled to as well, because a dry product settles and volume is not a reliable proxy.
Feeding directions
How much, how often, for what animal, under what conditions. They are part of what makes the product usable and part of what a state reviews.
Which is where claims creep in
A direction that says what the product will achieve has stopped being a direction. "Feed 50 g per head per day" is a direction. "Feed 50 g per head per day to prevent deficiency" is a claim about preventing a condition.
Species on the label, not just in the directions
What animal it is for is identity, not advice, and it interacts with the ruminant ban. A product whose directions mention cattle is unambiguously a product a ruminant could eat.
Weigh, do not measure
Bulk density varies between batches of the same ingredient, so a scoop is not a constant. Fill by weight, declare by weight, and keep the check weights.
Expect the container to look underfilled
Dry products settle in transit. A jar filled to the shoulder at packing arrives at two thirds, which generates complaints that are about perception rather than quantity.
Leave the room for all of it early
Ingredient declaration, guaranteed analysis, net quantity, name and address, feeding directions and a possible cautionary statement. Lay them out at legible sizes before choosing between two containers.
Directions are read by somebody standing up
In a barn, in poor light, possibly in a hurry. Short sentences, a clear rate and an unambiguous unit beat a paragraph that is technically complete.
State the unit the customer will measure in
Grams per head per day is precise and useless if nobody has a scale. A rate expressed in a scoop you supply, with the scoop's weight stated, is both precise and usable.