A dry extract like this Visterra product provides several practical differences compared to preparing an infusion (like tea). While tea uses raw or cut plant material steeped in hot water, a dry extract is created by processing the raw herb with a solvent (often water or ethanol) to draw out soluble compounds, then removing the liquid to leave a concentrated powder. This process allows you to take a consistent, measured amount of the plant's compounds in each capsule, without needing to prepare a drink every time.
The capsule form avoids the often strong, earthy, or bitter taste that many herbs, including Salsola collina, can have when brewed. It is also more convenient for people with busy schedules or who travel, as there's no need for brewing equipment. This product focuses solely on Salsola collina, so you are getting a single-herb extract. In traditional herbal practice, both forms have been used, but the dry extract in a capsule is chosen primarily for ease of use and to avoid the taste. Always check the supplement label for the extract strength and follow the recommended daily intake.