According to the Encyclopedia of Supplements, "This polyphenol found in the skin of apples has been shown to increase muscle growth and strength by increasing production of IGF-1 and reducing the amount of testosterone that gets converted to estrogen. It has also been shown to increase fat loss while simultaneously building more muscle. "
The cool thing is that no cycling is required for this supplement.
They suggest that you take 250 - l,500 mg 30-60 minutes before workouts. Patrick Arnold sells a version that is applied topically since oral ingestion has a low bioavailability. Taking it with a fat source is another way to increase the absorption.
If it does half of what's stated, it's worth buying. Especially at the price it can be obtained for.
The Encyclopedia of Supplements. Jim Stoppani Flex. 29.10 (Dec. 2011): p196.
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Links to articles on Ursolic Acid: