Sorry, I should've said "The only other boldenone that's popularly used"... but the suspension isn't that popular, not nearly as popular as Undecylenate anyway. You can get pretty much any ester attached to Boldenone, whether it's Acetate, Enanthate, Decanoate, etc. It's just a lot of them aren't that great, for some reason. A lot of people seem to believe Boldenone Acetate isn't as effective as as Boldenone Undecylenate; maybe the hormone in questions just needs more time to be active in the body to do it's job, regardless of ester attached.
The risk of hepatotoxicity and death associated with CPA treatment is reportedly the reason that CPA has not been approved by the FDA for use in the United States.  Patients being treated with high-dose CPA should be closely monitored with liver function tests .  The risk is dose-dependent, and the low doses of CPA used in birth control pills (2 mg) have been said to represent a non-significant risk.  However, a German woman who had been taking Diane-35 (containing 2 mg/day CPA) for contraception for 14 years died of liver cancer, and this led to a safety review by drug regulators and the eventual restriction of CPA throughout Europe for the indication of acne treatment in women.