We also provide testosterone gels that are a fairly new form of male hormone treatment used to raise levels of testosterone levels in men suffering from low testosterone levels. Testosterone gels provide balanced testosterone levels to the body via skin. Due to its ease in use and minimal skin irritation, testosterone gel is now the main option for men undergoing testosterone therapy who prefer a topical solution over a hormone shot. Some men find that testosterone gels don't provide enough of a testosterone boost, are concerned about transfer to a family member or lover, or find that gels and creams don't absorb well into their skin.
What amazed me about the relationship between Hypothyroidism and testosterone: For decades I had trouble with muscle development. I have been using synthroid for my Hashimotos Hypothyroidism. I recently switch to Naturethroid (a natural bio-identical hormone replacement,) and within 8 weeks, my muscles began to grow! I don’t think that changing from synthetic to natural analog was as much to blame for the growth as was the serendipitous increase in Free T3. I have a conversion problem that kept me from converting the T4 into T3. The Free T3 levels had always been within a “normal” range but at the bottom third of that range. Titrating The Naturethroid, which contains T3 as well as T4, to achieve Free T3 levels in the upper third of the range changed everything. I’ve not checked Free testosterone, but anecdotally — dramatic muscle increases globally, and oddly enough my voice decreased into a deeper tone. Overall more cheerful and clear headed.
Testosterone is significantly correlated with aggression and competitive behaviour and is directly facilitated by the latter. There are two theories on the role of testosterone in aggression and competition.  The first one is the challenge hypothesis which states that testosterone would increase during puberty thus facilitating reproductive and competitive behaviour which would include aggression.  Thus it is the challenge of competition among males of the species that facilitates aggression and violence.  Studies conducted have found direct correlation between testosterone and dominance especially among the most violent criminals in prison who had the highest testosterone levels.  The same research also found fathers (those outside competitive environments) had the lowest testosterone levels compared to other males.