The best product I know is from Gaspari Nutrition, "GASPARI - HALODROL LIQUID GELS 60 CAPS" and as I know they are better than Halodrol-50.
Halodrol-Liquigels is the ONLY product in the supplement world that contains Arachadonic Acid and a testosterone boosting anti-aromatase for a “one-two” punch in causing massive muscular hypertrophy, positive strength and endurance modulation and “help” in the bedroom. Nothing works like or as well as Halodrol-Liquigels AND NOTHING ELSE EVER WILL due to an exclusive licensing arrangement using a patented material and a patent-pending material.