Nested Naturals sells one bottle of 90 vegan capsules, and the label headlines 500mg per serving. The listing directs you to take two capsules once daily, so a single capsule holds 250mg of choline bitartrate, which is roughly 103mg of elemental choline. That makes the labeled serving about 205mg elemental: 48% of the 425mg Adequate Intake for women and 37% of the 550mg for men, with five to six capsules a day needed to cover that Adequate Intake from this product alone.
It scores where it does because one bitartrate above it states its 275mg of elemental choline outright instead of a salt weight and comes from a clinician line whose purity testing is its core selling point (Pure Encapsulations), and another prints the same 500mg figure on a single capsule rather than across two (Solaray, whose panel does not resolve whether that 500mg is elemental choline or salt weight). It also sits under two of the three citicoline picks, which deliver far less elemental choline per milligram but are the better-studied form for the cognitive half of the claim this label makes; the third citicoline pick lands below it.