I'am currently taking a product called T-Bol which is the combination....17 Hydrxyandrost-1-ene-3-one Ester(1-testosterone) and 4-androstendiol. Iam prone to gyno and am looking for a supplement which will help me gain mass and strength without the possibility of getting gyno. While using T-Bol iam also using 6-oxo. Will these prohormones cause gyno?