A two-piece shell filled with powder or granules, made of gelatin or plant cellulose.
A capsule is a two-piece shell — usually gelatin or plant-based cellulose (often labeled "veg" or "vegetarian") — that snaps together around a dry powder or granule fill. It carries no binders or coatings, so it typically holds fewer non-active ingredients than a tablet and can dissolve quickly.
Capsules suit dry ingredients and are a common choice when a brand wants a plant-based, additive-light option; oils are usually delivered in a softgel instead.