What do studies say about Testosteron Alltag?

The provided context does not contain specific studies on testosterone in daily life. Generally, testosterone is known to influence muscle mass, bone density, libido, and mood, but the evidence for its effects in everyday settings is mixed. Many studies are based on small samples or animal models, and their translation to individual daily life is limited. Direct-to-consumer tests (e.g., saliva) often measure total rather than free or bioavailable testosterone and are subject to diurnal variation. Without clinical evaluation, such results can be misleading. The evidence level is 'mixed' because there are both mechanistic and population-based hints, but no robust randomized trials for everyday contexts.