Potential benefits Testosterone support: Boron may influence free testosterone, but the evidence isn't strong enough to expect a dramatic increase in testosterone in healthy men. Training performance: Rhodiola may help with fatigue and exercise capacity. Recovery/stress support: Rhodiola is intended to help with fatigue and stress, which could indirectly support training. Muscle/strength: Any benefit would be indirect through improved training and potentially testosterone—not comparable to anabolic steroids or testosterone therapy.