Evidence supporting the use of: Rhodiola (unspecified)
For the health condition: Concentration (poor)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Rhodiola rosea, commonly referred to as Rhodiola, is an adaptogenic herb traditionally used in Russia and Scandinavia to enhance mental and physical performance. In recent years, scientific studies have explored its potential to support cognitive function, including concentration and attention. Several randomized, placebo-controlled trials have investigated Rhodiola's effects on mental fatigue, particularly under stress or fatigue-inducing conditions. For example, a study published in Phytomedicine (2012) found that Rhodiola supplementation improved attention, speed, and accuracy in cognitive tasks among physicians working night shifts. Another trial in Phytotherapy Research (2000) involving students during examination periods reported improved mental performance and reduced fatigue with Rhodiola extract compared to placebo.

The proposed mechanisms include modulation of neurotransmitters such as serotonin, dopamine, and norepinephrine, and reduction of stress-induced mental fatigue. However, most studies have been small, short in duration, and sometimes methodologically limited. Systematic reviews suggest a potential benefit but emphasize the need for larger, high-quality trials to confirm efficacy and determine optimal dosing. In summary, scientific evidence supports the use of Rhodiola for improving concentration under stress or fatigue, but the overall strength of evidence is moderate at best (rated 3 out of 5).

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