Capsules are one of the most convenient ways kratom powder is sold, according to a capsule guide on The Good Men Project. The leaves are dried and crushed into a fine powder, then filled into shells by the manufacturer, so each capsule arrives pre-measured with no scale, mixing or cleanup.
The guide describes two common shell types: gelatin, which it calls the more popular, and vegetarian shells made from cellulose and hypromellose. Sizes run from the small size 4 to the large size 000, with size 00 the most common middle ground. The shell masks the powder’s bitterness and keeps it from spilling, which makes capsules easy to carry, and the guide suggests storing them in an airtight container. Retailer guides generally note that capsules cost more per gram than loose powder, the trade-off for convenience.