Not worth the money. Its (usually) a topical DHT, which is great for not aromatizing to Estrogen, but poor choice for muscle growth as there are better alterations of DHT available like Anadrol or Anavar.
Save your $ and invest it into something else.
Just my .02
Don't forget winny as well, as it is also a DHT derived compound. I agree with HC though any topical hormone/test/DHT prep is better suited for women in menopause etc than guys with low test levels.