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Majeed et al. (2024), Medicine, 103(32), e39243. A 65-person, 15-day trial compared a black-seed oil and piperine capsule with placebo. It enrolled people aged 18–60, used a specific concentrated formula and had manufacturer-associated authors. Without an oil-only comparison, it cannot establish the added clinical benefit of the pepper extract. Read the original study.

Shoba et al. (1998), Planta Medica, 64(4), 353–356. The small human study used 2 g curcumin with 20 mg piperine and reported a 2,000% increase in bioavailability. That finding concerns the tested compounds and amounts, rather than the health effects of a household spice blend. Read the original study.

McKay et al. (2010), Journal of Nutrition, 140(2), 298–303. In a six-week trial with 65 adults who were not taking blood-pressure medicines, the top reading fell more with hibiscus tea than with the comparison drink. This was a study of hibiscus alone. Read the original study.

Haroyan et al. (2018), BMC Complementary and Alternative Medicine. A 12-week trial in 201 adults compared concentrated curcumin and curcumin–boswellia formulas with placebo. The combination improved pain and movement measures, but the different formulas do not isolate each ingredient’s added benefit. This was an extract study, not a home spice recipe. Read the original study.

Koetter et al. (2007), Phytotherapy Research. A small four-week trial compared valerian extract, the same valerian amount with hop extract, and placebo. The combination shortened time to sleep compared with placebo; valerian alone did not show a clear difference. This does not mean a tea gives the same result, and findings across sleep studies are mixed. Read the original study.

Satchell et al. (2002) compared 25% and 50% tea-tree solutions with a comparison solution for four weeks. Symptoms improved more in the tea-tree groups. The tested remedies and the athlete’s-foot use are separate from the acne combination on the book’s next page. Read the source

Godard et al. (2005) studied a forskolin-rich extract for 12 weeks in 30 overweight or obese men. Body-fat measures improved, without a clear body-weight reduction. The book discusses weight management with mixed evidence, rather than promising a particular amount of weight loss. Read the source

The European Medicines Agency recognises a traditional use of medicinal myrrh remedies for small mouth ulcers and minor mouth inflammation. This recognition is based on longstanding use; the book gives instructions for a diluted medicinal tincture rinse. Read the source

Panahi et al. (2015) followed 100 men with pattern hair loss for six months. Hair counts increased in both groups at six months, with no statistically significant difference between groups. There was no untreated group. This was not proof of treatment equivalence or a test against 5% minoxidil. Read the source

NCCIH describes conflicting or limited findings for milk-thistle extracts in liver disease. A funded trial in non-alcoholic steatohepatitis, a form of fatty liver disease, did not find a benefit. The book separates traditional digestive tea from research on silymarin extracts. Read the source

Raj et al. (2025) tested a specific DGL licorice-root extract against placebo in 200 adults over four weeks. Heartburn and regurgitation improved more with the extract. This trial does not establish the same result for ordinary root tea or every DGL product. Read the source

The European Medicines Agency documents traditional use of witch-hazel bark remedies for relief of hemorrhoid itching and burning. This is based on longstanding use. The guide gives an external bark-compress remedy and keeps psyllium’s separate stool-softening directions distinct. Read the source

Yin et al. (2008), Metabolism. An early three-month comparison in 36 adults with newly diagnosed type 2 diabetes reported similar blood-sugar reductions with berberine and metformin. This pilot does not establish treatment interchangeability. Read the original study.

Ji et al. (2025), JAMA Network Open. A 113-person phase 2 trial investigated berberine ursodeoxycholate, a specific compound. It is distinct from ordinary berberine supplements and from a homemade herbal remedy. Read the original trial.

Prices checked 29 October 2026: Buddha Teas hibiscus, $7.95 for 27 g, supplied as 18 bags of 1.5 g; Bulk Apothecary / Starwest dried hibiscus, $16.28 for 1 lb (about 453.6 g). Calculation: $7.95 ÷ 18 = $0.442 per bag. $16.28 ÷ (453.6 ÷ 1.5) = $0.054 per 1.5 g loose-herb portion. Rounded headline: about 44¢ versus 5¢. These are different suppliers and formats; the comparison does not establish identical product quality, remedy or therapeutic results. It excludes shipping, tax, equipment and remedy time. Prices may change.

The 2007 randomized, double-blind trial compared a fixed tablet containing thyme-herb and primrose-root dry extracts with placebo in 361 adults over 11 days. The result concerns that extract tablet; the household tea is a separate remedy. Read the original trial.

The randomized, double-blind study assigned 80 menopausal women to fresh Salvia officinalis extract tablets or placebo for four weeks. Menopause symptom scores improved with the studied extract. The trial did not test a household leaf tea. Read the original trial.

The November 2023 Cochrane review found that cranberry products probably reduce symptomatic, culture-verified urinary infections in women with recurrent infections. It studied prevention, not treatment of an existing infection, and does not establish that every juice has the same effect. Read the systematic review.

The FDA’s OTC monograph M016 recognizes colloidal oatmeal as a skin-protectant ingredient. That recognition concerns the specified processed ingredient, not every coarsely ground kitchen grain. Read the FDA monograph.

The European Medicines Agency separately describes oat herb for mild mental stress and sleep on the basis of traditional use. This is the green herb rather than the colloidal grain remedy. Read the EMA assessment.