Because the Nandrolone hormone is so suppressive to natural testosterone production, if the individual experiences sexually related side effects like erectile dysfunction or loss of libido, often they make inappropriate adjustments. Many automatically assume their testosterone dose must be too low. Even if their Deca Durabolin doses are at the low end range, if issues arise they simply increase the testosterone dose. In some cases, this may remedy the problem, but often it only makes it worse. If you’re having issues, the odds are strong your hormone levels are unbalanced. If you’re not controlling estrogen and estrogen levels get too high, you may have sexually related side effects. If you then add more testosterone, thereby adding more aromatase activity, you are only exasperating the problem. Then we have the opposite, you are controlling estrogen but you’re taking it too far. If you completely suppress estrogen through high levels of Aromatase Inhibitor use, you will strongly increase the probability of sexually related side effects.