Natural Ingredient Research & Evidence
How much research exists on natural ingredients, with an evidence snapshot across honey, algae, oils, clays and charcoal, and how to read studies. A PubMed count is not proof of benefit.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
Evidence snapshot
The table counts PubMed records mentioning each ingredient. The counts are crude: "honey" includes honeybee science; "seaweed" includes marine biology and food science; "bentonite" and "magnesium sulfate" (used for Epsom salt) include industrial and hospital uses; "olive oil" and "cocoa" include dietary research. A count shows how much has been published, not whether something works.| Ingredient | Records tagged as randomized controlled trials | Records tagged as any clinical trial | All PubMed records that mention it | Check it yourself |
|---|---|---|---|---|
| Honey | 269 | 315 | 19,602 | PubMed search |
| Manuka honey | 44 | 47 | 959 | PubMed search |
| Propolis | 134 | 161 | 5,660 | PubMed search |
| Royal jelly | 28 | 32 | 1,512 | PubMed search |
| Bee pollen | 3 | 3 | 749 | PubMed search |
| Spirulina | 87 | 106 | 4,271 | PubMed search |
| Chlorella | 29 | 38 | 9,767 | PubMed search |
| Seaweed / sea moss / kelp | 80 | 100 | 13,572 | PubMed search |
| Apple cider vinegar | 5 | 6 | 171 | PubMed search |
| Cacao / cocoa | 308 | 346 | 6,196 | PubMed search |
| Oats / colloidal oatmeal | 65 | 81 | 665 | PubMed search |
| Coconut oil | 125 | 147 | 2,913 | PubMed search |
| Olive oil | 1107 | 1218 | 14,848 | PubMed search |
| Castor oil | 55 | 80 | 2,860 | PubMed search |
| Jojoba | 12 | 20 | 305 | PubMed search |
| Shea butter | 10 | 13 | 157 | PubMed search |
| Mastic gum | 17 | 21 | 499 | PubMed search |
| Shilajit | 7 | 9 | 122 | PubMed search |
| Bentonite / kaolin clay | 73 | 111 | 7,828 | PubMed search |
| Activated charcoal | 189 | 238 | 3,922 | PubMed search |
| Epsom salt / magnesium sulfate | 591 | 689 | 5,350 | PubMed search |
Counted 2026-10-22 using NCBI E-utilities. Counts include studies of extracts, blends and non-health topics, and a trial can find no effect. A higher count means more human research has been indexed, not that something works.
What reviews found
- Honey on wounds: a Cochrane review pooled 26 trials (3,011 people) and found higher-quality evidence only for partial-thickness burns, with most other evidence low quality. [1]
- Spirulina and chlorella: meta-analysis found a neutral effect for chlorella and a small spirulina blood-pressure effect of uncertain significance. [2]
- Detoxes: NCCIH found no compelling research. [3]
How to read these studies
- Which exact product? A medical honey dressing, a food, and a supplement are different.
- Human or lab? Do not turn laboratory antimicrobial activity into a claim that an ingredient treats infections.
- How many people, how long, who funded it? The honey wound review disclosed a dressing manufacturer's contribution to one included trial; the algae review lists a company affiliation. [1][2]
- Negative and mixed results count.
References
- Jull AB, Cullum N, Dumville JC, Westby MJ, Deshpande S, Walker N. Honey as a topical treatment for wounds. Cochrane Database Syst Rev. 2015;(3):CD005083. PubMed 25742878. Several authors were investigators in an included trial that received a small contribution from a honey dressing manufacturer (disclosed in the review).
- Pinto-Leite M, et al. The Role of Chlorella and Spirulina as Adjuvants of Cardiovascular Risk Factor Control: A Systematic Review and Meta-Analysis of Randomised Controlled Trials. Nutrients. 2025;17(6):943. PubMed 40289965. Two authors list an affiliation with Sea4Us SA, a company, in the paper.
- National Center for Complementary and Integrative Health (NIH). "Detoxes" and "Cleanses": What You Need To Know.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.