Ginseng Classic Formulas … Natural Herb Library

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Powerfully tonifies source qi - Ren Shen is the flagship qi tonic for collapse, profound fatigue, weak pulse, and severe constitutional depletion.
Strengthens the Spleen and Lung - traditional use includes shortness of breath, poor appetite, weak digestion, and chronic cough from deficiency rather than excess.
Generates fluids and stops thirst - it is used when deficiency damages fluids, producing dry mouth, wasting-thirst presentations, or post-illness depletion.
Calms the spirit - later use extends to palpitations, insomnia, and emotional depletion when qi and fluids no longer anchor the Heart well.

Si Jun Zi Tang - the foundational Spleen-Qi tonic formula built around Ren Shen.
Sheng Mai San - classic formula in which Ren Shen restores qi while Mai Men Dong and Wu Wei Zi preserve fluids and leakage.
Du Shen Tang and Shen Fu Tang lineages - collapse-rescue formulas that show Ren Shen at its strongest traditional end.

Traditional materia medica describe Ren Shen as sweet, slightly bitter, and slightly warm, entering the Spleen, Lung, and Heart to strongly tonify primal qi and generate fluids.
Classical teaching also preserves the well-known incompatibility caution with Li Lu and the antagonist relationship with Wu Ling Zhi.