1. 1.Mishra S, Stierman B, Gahche JJ, Potischman N. Dietary supplement use among adults: United States, 2017–2018. NCHS Data Brief. 2021;(399):1-8.

2. Smith T, Majid, F, Eckl V, Reynolds CM. Herbal supplements sales in US increase by record-breaking 17.3% in 2020: sales of immune health, stress relief, and heart health supplements grow during COVID-19 pandemic. HerbalGram. 2021;(131):52-65.

3. TRC Healthcare Natural Medicines Database. Apple Cider Vinegar. Available at https://naturalmedicines.therapeuticresearch.com/Data/ProMonographs/Apple-Cider-Vinegar. Last accessed October 23, 2025.

4. TRC Healthcare Natural Medicines Database. Ashwagandha. Available at https://naturalmedicines.therapeuticresearch.com/Data/ProMonographs/Ashwagandha. Last accessed October 23, 2025.

5. TRC Healthcare Natural Medicines Database. Echinacea. Available at https://naturalmedicines.therapeuticresearch.com/Data/ProMonographs/Echinacea. Last accessed October 23, 2025.

6. TRC Healthcare Natural Medicines Database. Elderberry. Available at https://naturalmedicines.therapeuticresearch.com/Data/ProMonographs/Elderberry. Last accessed October 23, 2025.

7. TRC Healthcare Natural Medicines Database. Turmeric. Available at https://naturalmedicines.therapeuticresearch.com/Data/ProMonographs/Turmeric. Last accessed October 23, 2025.

8. Smith T, Resetar H, Morton C. US Sales of Herbal Supplements Increase by 9.7% in 2021. Available at https://umb.herbalgram.org/media/inclpjky/hg136-hmr.pdf. Last accessed October 23, 2025.

9. American Botanical Council. US Sales of Herbal Supplements Increased by 5.4% in 2024. Available at https://www.herbalgram.org/news/press-releases/2025/us-sales-herbal-supplements-2024-increase/. Last accessed October 23, 2025.