Coffee Leaf
The leaves of the coffee plant have been consumed for hundreds of years for medicinal purposes. Studies show that coffee leaves are high in mangiferin, chlorogenic acid, EGCG, and theobromine. Coffee leaf is anti-inflammatory, and is a strong source of antioxidants, and aids in improving brain function.
Research
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Mangiferin: https://lipidworld.biomedcentral.com/articles/10.1186/s12944-017-0449-y
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Chlorogenic Acid: https://examine.com/supplements/chlorogenic-acid/
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Coffee Leaves and COVID: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9305275/
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The Benefit of Different Age Leaves: Effects of processing method and age of leaves on phytochemical profiles and bioactivity of coffee leaves - ScienceDirect
Guava Leaf
Guava Leaf is best known for lowering blood sugar. In fact, research shows that drinking guava leaf tea after meals reduces blood sugar by more than 10 percent. Guava Leaf has many other benefits including digestion, skincare, and immunity.
Research:
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Benefits of Guava: https://www.healthline.com/nutrition/8-benefits-of-guavas#TOC_TITLE_HDR_8
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Blood Sugar Benefits: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2831039/
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Digestion: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3329747/
Olive Leaf
Olive Leaves are used to treat infections and reduce cholesterol and reduce blood pressure. Olive leaves contain a compound called oleuropein which is more effective then than pure oleuropein at lowering cholesterol.
Research
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Summary of Olive Leaf: https://www.mskcc.org/cancer-care/integrative-medicine/herbs/olive-leaf#:~:text=Derived%20from%20the%20olive%20plant,%2Dinflammatory%20activity%20(23).
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Health Effects of Olive Leaf: (PDF) Review: Beneficial Health Effects of Olive Leaves Extracts (researchgate.net
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Olive Leaf and COVID: Olive Leaves as a Potential Phytotherapy in the Treatment of COVID-19 Disease; A Mini-Review - PMC (nih.gov)
Passion Flower Leaf
Passiflora incarnata is native to the tropical regions in the Americas. It is known to aid in sleep and anxiety.