Because tongkat ali root is mostly cellulose, purchase rule 1 is: if you buy capsules, only buy tongkat ali extract, not just tongkat ali.
When an extract is made, the active ingredients are extracted from the root, and the remaining cellulose is discarded. Extracts can have various proportions (the amount of active ingredients that is extracted). For example, an extract that is 1:50 gets 1 gram of active ingredients from 50 gram of tongkat ali root. An extract that is 1:100 uses 100 gram of root to produce 1 gram of extract, and a 1:200 extract is even more concentrated. It needs 200 gram of tongkat ali root to prepare just 1 gram of extract. Thus, among the various tongkat ali extracts cited above, 1:200 is the most concentrated and strongest form.
However, if a bottle of capsules just says "Tongkat Ali Extract", without specifying a proportion, then the extract is likely only 1:5, or maybe even only 1:2. This means that only 5, or just 2, gram of tongkat ali root were used to obtain 1 gram of extract. Thus, assuming an equal capsule size, you would need 40 capsules (or, at worst 100 capsules) of such a tongkat ali extract of unspecified strength to obtain as much active ingredient as you can get from just one capsule of 1:200 extract.