Rhodiola Rosea for improving endurance performance

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"Acute R. rosea ingestion decreases heart rate response to submaximal exercise and appears to improve endurance exercise performance by decreasing the perception of effort" -Reference >Pub Med
J Strength Cond Res. 2013 Mar;27(3):839-47. doi: 10.1519/JSC.0b013e31825d9799.
The effects of an acute dose of Rhodiola rosea on endurance exercise performance.