Bridging with Enth, is like not coming off. Primo and enth are completely different compounds bro. Primo at low doses allows your natural test levels to return to normal, doesn't screw with your HTPA levels, and doesn't convert to estrogen, so anti Es are not a concern. Test will not allow your natural test levels to return to normal, does screw with HTPA levels and does convert to estrogen. This is the reason we use the steroids primo or anavar, and other drugs like GH, insulin, T3 and clen to bridge, and not test. BUT, that doesn't mean you can't use test between cycles. Its just not really considered a bridge. Later