Testosteron Test: which supplements make sense?

Based on the provided context, there is no specific information about testosterone testing or supplement recommendations. The context focuses on DNA variants and their limited predictive power, not on hormone levels or supplementation. In general, a single testosterone measurement is insufficient to guide supplement use because levels fluctuate due to circadian rhythm, sleep, diet, stress, and exercise. Some supplements (e.g., vitamin D, zinc, magnesium, D-aspartic acid) are commonly mentioned in popular literature, but the evidence for clinically meaningful testosterone increases in healthy individuals is weak. Most studies show small effects, and benefits are mainly seen in those with a confirmed deficiency. Over-supplementation carries risks (e.g., zinc toxicity, vitamin D overdose). Without repeated lab tests and medical supervision, supplement recommendations are not evidence-based. The context does not provide any validated protocols or product details. Therefore, the evidence grade is 'unclear'. A physician should interpret any hormone test before starting supplements.