Nature's Sunshine Echinacea Purpurea contains echinacea herb only. Echinacea is one of the best known herbs for immune support and is commonly taken during colder months or when you feel your resistance is being tested. It is also popular for seasonal use because it supports the body's natural defence response.
Echinacea contains compounds such as polysaccharides, alkamides and flavonoids, which are part of why the herb has been studied so much for immune function. If you want a straightforward echinacea product without extra herbs added, this keeps the focus on the herb itself.