This is the powder rather than the capsules. 
 
It is important to note that many companies do not disclose their Boswellic Acid content because it is very low. Riaflex contain 65% Boswellic Acids. Many other companies when you enquire contain just 1-15%.
 
Commonly known as Frankincense, Boswellia contains Boswellic acid, which has well known joint support and comfort properties and has also been shown to help maintain the structural integrity of connective tissues. It has also been shown to soothe digestive issues, can help to firm loose droppings, and is thought to support the respiratory system.
 
The mechanism of anti-inflammatory activity of the Boswellia extract is due to the boswellic acids, which are the active component of Frankincense. Riaflex contains 65% Boswellic acids. The chemical structure of boswellic acids closely resembles that of steroids, but their actions are different from prescription meds or NSAIDs. It is believed they help to maintain a healthy level of 5-lipoxygenase (5-LOX) activity, which in turn helps to inhibit inflammation.