This study investigated the tonifying properties of phytochemical extracts marketed as nutraceuticals, specifically their potential to enhance Yang, Qi, Yin, and Blood functions according to Chinese medicine theory. We assessed four extracts enriched with quercetin, resveratrol, catechins, and curcumin through established pharmacological assays for each functional category of Chinese tonifying herbs. Results indicate that none of the extracts demonstrated Yang or Qi-invigorating effects, suggesting that they do not enhance cellular energy metabolism similar to Yang and Qi tonifying herbs. The resveratrol-enriched extract exhibited some Yin-nourishing properties, albeit less effective than the Yin herb Ligustri Lucidum Fructus. Additionally, catechin- and curcumin-enriched extracts increased nitric oxide production but did not stimulate erythropoietin levels, raising questions about their Blood-enrichment capabilities. Overall, the findings suggest that while these nutraceuticals offer various health benefits, they may not significantly influence the Zang Xiang physiological system in Chinese medicine, highlighting the importance of using Chinese tonifying herbs for a holistic approach to safeguarding health.
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