Iacovides, S., Avidon, I., & Baker, F. C. (2015). What we know about primary dysmenorrhea today: A critical review. Human Reproduction Update, 21(6), 762-778. https://doi.org/10.1093/humupd/dmv039
Tier 2Peer-reviewed critical review
Establishes that primary dysmenorrhea is driven by prostaglandins, the mechanism anti-inflammatory herbs are studied for. Background framing, not a claim that any tea treats cramps.
Pattanittum, P., Kunyanone, N., Brown, J., Sangkomkamhang, U. S., Barnes, J., Seyfoddin, V., & Marjoribanks, J. (2016). Dietary supplements for dysmenorrhoea. Cochrane Database of Systematic Reviews, 2016(3), CD002124. https://doi.org/10.1002/14651858.CD002124.pub2
Tier 1Cochrane systematic review (27 RCTs)
Reviewed dietary supplements (incl. chamomile, cinnamon, fennel, ginger) for period pain and found the evidence promising but methodologically limited, with no high-quality conclusion for any one supplement. The discipline citation for the page.
Niazi, A., & Moradi, M. (2021). The effect of chamomile on pain and menstrual bleeding in primary dysmenorrhea: A systematic review. International Journal of Community Based Nursing and Midwifery, 9(3), 174-186. https://doi.org/10.30476/IJCBNM.2021.87219.1417
Tier 2Systematic review (7 trials)
Pooled 7 chamomile trials and concluded chamomile may be an effective traditional intervention for period pain, with heterogeneous methods and mostly gram-level doses, not tea-cup doses. Most trials were Iranian student populations, limiting generalisability.
Daily, J. W., Zhang, X., Kim, D. S., & Park, S. (2015). Efficacy of ginger for alleviating the symptoms of primary dysmenorrhea: A systematic review and meta-analysis of randomized clinical trials. Pain Medicine, 16(12), 2243-2255. https://doi.org/10.1111/pme.12853
Tier 2Systematic review and meta-analysis
Found ginger reduced period-pain scores versus placebo. INFORMATIONAL ONLY: ginger is not an ingredient in Sippo teas, cited to show the strongest single-herb evidence is for something we do not make.
Amsterdam, J. D., Li, Y., Soeller, I., Rockwell, K., Mao, J. J., & Shults, J. (2009). A randomized, double-blind, placebo-controlled trial of oral Matricaria recutita (chamomile) extract therapy for generalized anxiety disorder. Journal of Clinical Psychopharmacology, 29(4), 378-382. https://doi.org/10.1097/JCP.0b013e3181ac935c
Tier 2Randomised controlled trial
Chamomile extract reduced generalised anxiety symptoms versus placebo over 8 weeks. Used a standardised extract, not tea, so cited for the calming mechanism behind a soothing ritual, not as proof a teabag treats anything.