A total of 20 non-steroid drugs were also tested. All products that would be defined as common ancillary drugs including tamoxifen citrate (Nolvadex), clomiphene citrate (Clomid), thyroid hormone, caffeine, and yohimbine hcl turned out to be legitimate. This underlines the lower risk in these ancillary drug items, no doubt due to the lower financial incentive for counterfeiters to duplicate these cheap and easy to access pharmaceuticals. The only non-steroid drugs where there was some substitution noted were in the male sexual performance category, which constitute drugs such as Viagra and Cialis. In most of the individual cases the drugs did test out as labeled. When they did fail testing, however, it was usually for the substitution of active ingredients of the same drug family. Male sexual performance products are known to be an active area of counterfeiting, so care should be taken when purchasing these products from illicit channels as well.