Plant Comparison
Borage vs Stinging Nettle
A side-by-side comparison of two medicinal plants — every documented constituent, action, use, safety note and cited source, assembled automatically from the Omnia Sana database.
At a glance
Borage and Stinging Nettle: they share 7 indicated uses (arthritis / joint pain, back pain, cancer (anticancer research), …); 4 pharmacological actions in common.
Evidence face-off — shared uses
| Condition | Borage | Stinging Nettle | Verdict |
|---|---|---|---|
| Arthritis / joint pain | 1/10 | 7/10 | Stronger for Stinging Nettle |
| Back pain | 1/10 | 1/10 | Comparable evidence |
| Cancer (anticancer research) | 2/10 | 7/10 | Stronger for Stinging Nettle |
| Cold & flu | 1/10 | 1/10 | Comparable evidence |
| Immune support | 1/10 | 1/10 | Comparable evidence |
| Inflammation (general) | 1/10 | 1/10 | Comparable evidence |
| Skin irritation | 1/10 | 1/10 | Comparable evidence |
Evidence scores (1–10) are computed from the tier of each cited source. “Comparable” means the two scores are within one point. Follow a score to its detailed sources.
Key Constituents
Borage seed oil has one of the highest known GLA contents of any plant oil (typically 20-26%), the basis of its anti-inflammatory reputation.
Unsaturated pyrrolizidine alkaloids present in the whole herb are hepatotoxic and genotoxic on cumulative exposure, limiting internal whole-herb use; the refined seed oil is largely free of them.
Contribute to the plant's traditional demulcent and astringent properties.
Contribute to the antioxidant and anti-inflammatory action.
Thought to underlie the root's traditional use for BPH-related urinary symptoms.
The irritant compounds responsible for the fresh plant's sting; destroyed by cooking, drying or freeze-drying.
Pharmacological Actions
Traditional & Indicated Uses
inferred from anti-inflammatory action
inferred from anticancer action
inferred from immunomodulator action
inferred from digestive action
inferred from anti-inflammatory action
inferred from anti-rheumatic action
inferred from anticancer action
inferred from immunomodulator action
inferred from anti-inflammatory action
inferred from anti-inflammatory action
inferred from diuretic action
Safety, Cautions & Contraindications
Pyrrolizidine alkaloids (PAs): Many Boraginaceae can produce PAs; unsaturated PAs are hepatotoxic and genotoxic (risk increases with cumulative exposure). Borage as food/tea: PA presence in borage consumed as herb/tea has been specifically studied; EU has set PA maximum levels for certain foods including borage (context for why sourcing/limits matter). Pregnancy/breastfeeding: avoid internal use of borage herb products due to PA-related concerns and risk uncertainty. Liver disease / long-term use: avoid (PA risk + cumulative exposure logic). Seed oil vs herb: refined/quality-controlled seed oil is generally the preferred form when borage is used medicinally, because the main target compound is GLA; however, product quality and contamination control still matter. Drug interactions (caution): GLA oils have been discussed with anticoagulants (bleeding risk caution is better established for evening primrose oil; borage oil is often grouped in the same “GLA oil” category). Use caution if on anticoagulants/antiplatelets.
Duke (2002) rates borage as a single-plus herb (+) with predominantly folklore-level evidence. Borage seed oil is rich in gamma-linolenic acid (GLA) and has been used for inflammatory conditions such as arthritis and PMS, and for cardiovascular support; typical dose is one 300 mg softgel containing 24% GLA or 2-4 ml liquid leaf extract. Commission E does not approve borage for any indication, and the herb contains hepatotoxic and carcinogenic pyrrolizidine alkaloids, making long-term use inadvisable (Duke, 2002).
Fresh plant causes stinging skin reaction (formic acid, histamine). Once cooked, dried, or freeze-dried, this is eliminated. Root tincture may interact with diuretics, antihypertensives, and antidiabetic drugs. Generally very safe in culinary and standard medicinal use. Avoid very high doses in pregnancy.
Duke (2002) rates stinging nettle as +++ and provides clinical evidence (score 2) for antiprostatitic activity (BPH — benign prostatic hyperplasia), consistent with Commission E approval for irritative urination symptoms associated with BPH. Dose: 4–6 g dried herb daily or 600–1200 mg root extract. The root preparations are used for BPH while leaf preparations are used for antiallergic and anti-inflammatory purposes. Duke also notes experimental antiarthritic and analgesic activity. Generally safe; the most common adverse effect is mild gastrointestinal upset (Duke, 2002).
External Ids
Botanical Description
Robust, bristly annual herb with hollow, branching stems covered in coarse, stiff hairs. The leaves are large, oval and wrinkled, also coarsely hairy, and smell of cucumber when crushed. The flowers are strikingly bright blue, star-shaped with five pointed petals and a prominent black central cone of anthers, borne in nodding clusters.[1]
Tall, upright perennial herb with square stems and opposite, deeply toothed, heart-shaped to lance-shaped leaves covered in fine stinging hairs that inject formic acid and histamine on contact. Tiny, greenish, petal-less flowers hang in branched, drooping clusters from the leaf axils.[11]
Habitat
Grows readily on disturbed, nutrient-rich ground, gardens, waste places and field margins; native to the Mediterranean region and widely naturalised and cultivated across Europe and elsewhere as a culinary and oil-seed crop.[1]
Grows abundantly on nitrogen-rich waste ground, hedgerows, riverbanks, woodland edges and disturbed soil; native to Europe, Asia, North Africa and North America and now found nearly worldwide.[11]
Harvesting
Leaves and flowers are picked fresh through the growing season, at their best just as the flowers open; the seed is collected in late summer once the seed heads have dried, pressed for its gamma-linolenic-acid-rich oil.[1]
Young leaves and tops are gathered in spring before flowering, when stinging is least severe and nutrient content highest, using gloves; the root is dug in autumn or spring; seed is collected when ripe in late summer. Cooking, drying or freeze-drying neutralises the sting.[11]
Traditional Uses
Borage has a long folk reputation, reflected in the old saying 'borage for courage', as a mood-lifting, cooling herb for feverish colds and respiratory complaints, and as a digestive and anti-inflammatory remedy; the fresh leaves and flowers have also been used culinarily. Modern use is centred on the seed oil, rich in gamma-linolenic acid (GLA), for inflammatory and skin conditions.[1]
Nettle leaf has a long tradition as a nutritive spring tonic, diuretic and anti-inflammatory remedy for joint pain and rheumatism, while the root has a well-documented traditional and modern use for the irritative urinary symptoms of benign prostatic hyperplasia; the seed has a lighter tradition as a kidney tonic.[11, 12, 13]
Preparations
Dosage
A phase-two randomised placebo-controlled trial in moderate persistent asthma used Borago officinalis extract at 5 mL three times daily for one month. Because of pyrrolizidine alkaloid content, whole-herb (leaf/flower) preparations should only be used short-term and from PA-controlled sources; avoid in pregnancy, breastfeeding and liver disease. Educational reference only, not a prescription.
The EU herbal monograph on nettle leaf gives 2-4 g as a single dose for herbal tea, 3-6 times daily, for a daily dose equivalent to 8-12 g, in adolescents, adults and elderly; a 1:5 liquid extract at 30-40 drops 3-4 times daily and several dry extracts are also listed. Not to be used for more than 4 weeks, and not recommended under 12 years. Educational reference only, not a prescription.
Traditional and Commission E sources suggest around 600-1200 mg root extract daily for BPH-related urinary symptoms. Educational reference only, not a prescription.
References
Lookalikes Review
Dangerous Lookalikes
Not documented
References & Sources
- Slama, M., Slougui, N., Benaissa, A., Nekkaa, A. et al (2024) 'Borago officinalis L.: A Review on Extraction, Phytochemical, and Pharmacological Activities', Chemistry & Biodiversity, 21(5), pp. e202301822. doi:10.1002/cbdv.202301822 Traditional / reference
https://doi.org/10.1002/cbdv.202301822 - Michalak, M., Zagórska-Dziok, M., Klimek-Szczykutowicz, M. and Szopa, A (2023) 'Phenolic Profile and Comparison of the Antioxidant, Anti-Ageing, Anti-Inflammatory, and Protective Activities of Borago officinalis Extracts on Skin Cells', Molecules, 28(2), pp. 868. doi:10.3390/molecules28020868 Preclinical
https://doi.org/10.3390/molecules28020868 - Ghasemian, M., Owlia, S. and Owlia, M.B (2016) 'Review of Anti-Inflammatory Herbal Medicines', Advances in Pharmacological Sciences, 2016, pp. 9130979. doi:10.1155/2016/9130979 Traditional / reference
https://doi.org/10.1155/2016/9130979 - Di Cerbo, A., Carnevale, G., Avallone, R., Zavatti, M. and Corsi, L (2020) 'Protective Effects of Borago officinalis (Borago) on Cold Restraint Stress-Induced Gastric Ulcers in Rats: A Pilot Study', Frontiers in Veterinary Science, 7, pp. 427. doi:10.3389/fvets.2020.00427 Preclinical
https://doi.org/10.3389/fvets.2020.00427 - Seo, S.A., Park, B., Hwang, E., Park, S. and Yi, T (2018) 'Borago officinalis L. attenuates UVB-induced skin photodamage via regulation of AP-1 and Nrf2/ARE pathway in normal human dermal fibroblasts and promotion of collagen synthesis in hairless mice', Experimental Gerontology, 107, pp. 178-186. doi:10.1016/j.exger.2018.02.017 Preclinical
https://doi.org/10.1016/j.exger.2018.02.017 - Mirsadraee, M., Khashkhashi Moghaddam, S., Saeedi, P. and Ghaffari, S (2016) 'Effect of Borago Officinalis Extract on Moderate Persistent Asthma: A Phase two Randomized, Double Blind, Placebo-Controlled Clinical Trial', Tanaffos, 15(3), pp. 168-174. doi:10.1183/13993003.congress-2016.pa4116 Randomized trial
https://doi.org/10.1183/13993003.congress-2016.pa4116 - Lozano-Baena, M., Tasset, I., Munoz-Serrano, A., Alonso-Moraga, A. and de Haro-Bailon, A (2016) 'Cancer Prevention and Health Benefices of Traditionally Consumed Borago officinalis Plants', Nutrients, 8(1), pp. 48. doi:10.3390/nu8010048 Preclinical
https://doi.org/10.3390/nu8010048 - Rodriguez-Magana, M.P., Cordero-Perez, P., Rivas-Morales, C., Oranday-Cardenas, M.A., Moreno-Pena, D.P., Garcia-Hernandez, D.G. and Leos-Rivas, C (2019) 'Hypoglycemic Activity of Tilia americana, Borago officinalis, Chenopodium nuttalliae, and Piper sanctum on Wistar Rats', Journal of Diabetes Research, 2019, pp. 7836820. doi:10.1155/2019/7836820 Preclinical
https://doi.org/10.1155/2019/7836820 - Navarro-Herrera, D., Aranaz, P., Eder-Azanza, L., Zabala, M., Romo-Hualde, A., Hurtado, C., Calavia, D., Lopez-Yoldi, M., Martinez, J.A., Gonzalez-Navarro, C.J. and Vizmanos, J.L (2018) 'Borago officinalis seed oil (BSO), a natural source of omega-6 fatty acids, attenuates fat accumulation by activating peroxisomal beta-oxidation both in C. elegans and in diet-induced obese rats', Food & Function, 9(8), pp. 4340-4351. doi:10.1039/c8fo00423d Preclinical
https://doi.org/10.1039/c8fo00423d - Moliner, C., Casedas, G., Barros, L., Finimundy, T.C., Gomez-Rincon, C. and Lopez, V (2022) 'Neuroprotective Profile of Edible Flowers of Borage (Borago officinalis L.) in Two Different Models: Caenorhabditis elegans and Neuro-2a Cells', Antioxidants, 11(7), pp. 1244. doi:10.3390/antiox11071244 Preclinical
https://doi.org/10.3390/antiox11071244 - Samy, M.N., Hamed, A.N.E., Sugimoto, S., Otsuka, H., Kamel, M.S. and Matsunami, K (2015) 'Officinalioside, a new lignan glucoside from Borago officinalis L', Natural Product Research, 30(8), pp. 967-972. doi:10.1080/14786419.2015.1088540 Preclinical
https://doi.org/10.1080/14786419.2015.1088540 - Yue, Y., Jin, F. and Yue, X (2021) 'The effect of Borago officinalis on the signaling pathway of the NLRP3 inflammasome complex, TLR4 and some inflammatory cytokines in type II diabetic patients with acute respiratory distress syndrome', Cellular and Molecular Biology, 67(3), pp. 178-183. doi:10.14715/cmb/2021.67.3.28 Clinical study
https://doi.org/10.14715/cmb/2021.67.3.28 - Fernandes, L., Pereira, J.A., Saraiva, J.A., Ramalhosa, E. and Casal, S (2019) 'Phytochemical characterization of Borago officinalis L. and Centaurea cyanus L. during flower development', Food Research International, 123, pp. 771-778. doi:10.1016/j.foodres.2019.05.014 Preclinical
https://doi.org/10.1016/j.foodres.2019.05.014 - European Medicines Agency (HMPC) (2021) 'Public statement on the use of herbal medicinal products containing toxic, unsaturated pyrrolizidine alkaloids (PAs), including recommendations regarding contamination of herbal medicinal products with PAs, Revision 1'. Available at: https://www.ema.europa.eu/en/documents/public-statement/public-statement-use-herbal-medicinal-products-containing-toxic-unsaturated-pyrrolizidine-alkaloids-pas-including-recommendations-regarding-contamination-herbal-medicinal-products-pyrrolizidine_en.pdf Traditional / reference
https://www.ema.europa.eu/en/documents/public-statement/public-statement-use-herbal-medicinal-products-containing-toxic-unsaturated-pyrrolizidine-alkaloids-pas-including-recommendations-regarding-contamination-herbal-medicinal-products-pyrrolizidine_en.pdf - Kapoor, R. and Huang, Y.S (2006) 'Gamma linolenic acid: an antiinflammatory omega-6 fatty acid', 7(6), pp. 531--534. doi:10.2174/138920106779116874 Traditional / reference
https://doi.org/10.2174/138920106779116874 - Royal Botanic Gardens, Kew (n.d.). Available at: https://powo.science.kew.org Traditional / reference
https://powo.science.kew.org - World Health Organization (2002) 'WHO Monographs on Selected Medicinal Plants'. Traditional / reference
https://scholar.google.com/scholar?q=WHO%20Monographs%20on%20Selected%20Medicinal%20Plants - Duke, J.A (2002) 'Handbook of Medicinal Herbs, Second Edition'. Traditional / reference
https://scholar.google.com/scholar?q=Handbook%20of%20Medicinal%20Herbs%2C%20Second%20Edition - Negroni, M.S., Marengo, A., Caruso, D., et al (2019) 'A case report of accidental intoxication following ingestion of foxglove confused with borage: high digoxinemia without major complications', Case Reports in Cardiology, 2019, pp. 9707428. doi:10.1155/2019/9707428 Clinical study
https://doi.org/10.1155/2019/9707428 - Iraci, F. and Herdeg, C. and Holzwarth, M. and Storz, M.A (2023) 'Of mixed vegetables and cardiac arrhythmias - Digitalis purpurea confused with Borago officinalis: a case series of accidental digitoxin intoxications', Journal of Cardiology Cases, 28(2), pp. 86-90. doi:10.1016/j.jccase.2023.04.007 Clinical study
https://doi.org/10.1016/j.jccase.2023.04.007
- Durovic, S., Kojic, I., Radic, D., Smyatskaya, Y.A. and others (2024) 'Chemical Constituents of Stinging Nettle (Urtica dioica L.): A Comprehensive Review on Phenolic and Polyphenolic Compounds and Their Bioactivity', International Journal of Molecular Sciences, 25(6), pp. 3430. doi:10.3390/ijms25063430 Meta-analysis / review
https://doi.org/10.3390/ijms25063430 - Semwal, P., Rauf, A., Olatunde, A., Singh, P. and others (2023) 'The medicinal chemistry of Urtica dioica L.: from preliminary evidence to clinical studies supporting its neuroprotective activity', Natural Products and Bioprospecting, 13(1), pp. 16. doi:10.1007/s13659-023-00380-5 Meta-analysis / review
https://doi.org/10.1007/s13659-023-00380-5 - Esposito, S., Bianco, A., Russo, R., Di Maro, A. and others (2019) 'Therapeutic Perspectives of Molecules from Urtica dioica Extracts for Cancer Treatment', Molecules, 24(15), pp. 2753. doi:10.3390/molecules24152753 Meta-analysis / review
https://doi.org/10.3390/molecules24152753 - Ziaei, R., Foshati, S., Hadi, A., Kermani, M.A.H. and others (2020) 'The effect of nettle (Urtica dioica) supplementation on the glycemic control of patients with type 2 diabetes mellitus: A systematic review and meta-analysis', Phytotherapy Research, 34(2), pp. 282-294. doi:10.1002/ptr.6535 Meta-analysis / review
https://doi.org/10.1002/ptr.6535 - Chrubasik, J.E., Roufogalis, B.D., Wagner, H. and Chrubasik, S (2007) 'A comprehensive review on the stinging nettle effect and efficacy profiles. Part II: urticae radix', Phytomedicine, 14(7-8), pp. 568-579. doi:10.1016/j.phymed.2007.03.014 Meta-analysis / review
https://doi.org/10.1016/j.phymed.2007.03.014 - Koch, E (2001) 'Extracts from fruits of saw palmetto (Sabal serrulata) and roots of stinging nettle (Urtica dioica): viable alternatives in the medical treatment of benign prostatic hyperplasia and associated lower urinary tract symptoms', Planta Medica, 67(6), pp. 489-500. doi:10.1055/s-2001-16496 Preclinical
https://doi.org/10.1055/s-2001-16496 - Azimi, H., Khakshur, A.A., Aghdasi, I., Fallah-Tafti, M. and others (2012) 'A review of animal and human studies for management of benign prostatic hyperplasia with natural products: perspective of new pharmacological agents', Inflammation & Allergy Drug Targets, 11(3), pp. 207-221. doi:10.2174/187152812800392715 Meta-analysis / review
https://doi.org/10.2174/187152812800392715 - Bhusal, K.K., Magar, S.K., Thapa, R., Lamsal, A. and others (2022) 'Nutritional and pharmacological importance of stinging nettle (Urtica dioica L.): A review', Heliyon, 8(6), pp. e09717. doi:10.1016/j.heliyon.2022.e09717 Meta-analysis / review
https://doi.org/10.1016/j.heliyon.2022.e09717 - Dhouibi, R., Affes, H., Ben Salem, M., Hammami, S. and others (2020) 'Screening of pharmacological uses of Urtica dioica and other benefits', Progress in Biophysics and Molecular Biology, 150, pp. 67-77. doi:10.1016/j.pbiomolbio.2019.05.008 Meta-analysis / review
https://doi.org/10.1016/j.pbiomolbio.2019.05.008 - Saponaro, M., Giacomini, I., Morandin, G., Cocetta, V. and others (2020) 'Serenoa repens and Urtica dioica Fixed Combination: In-Vitro Validation of a Therapy for Benign Prostatic Hyperplasia (BPH)', International Journal of Molecular Sciences, 21(23), pp. 9178. doi:10.3390/ijms21239178 Preclinical
https://doi.org/10.3390/ijms21239178 - Grieve, M (1931) 'A Modern Herbal'. Traditional / reference
https://scholar.google.com/scholar?q=A%20Modern%20Herbal - Chrubasik, J.E., Roufogalis, B.D. and Chrubasik, S (2007) 'Evidence of effectiveness of herbal anti-inflammatory drugs in the treatment of painful osteoarthritis and chronic low back pain', 21(7), pp. 675--683. Traditional / reference
https://scholar.google.com/scholar?q=Evidence%20of%20effectiveness%20of%20herbal%20anti-inflammatory%20drugs%20in%20the%20treatment%20of%20painful%20osteoarthritis%20and%20chronic%20low%20back%20pain - Schlichte, D.A. et al (2016) 'Efficacy of stinging nettle root extract for benign prostatic hyperplasia symptoms', 8(1), pp. 57--62. Traditional / reference
https://scholar.google.com/scholar?q=Efficacy%20of%20stinging%20nettle%20root%20extract%20for%20benign%20prostatic%20hyperplasia%20symptoms - European Medicines Agency (HMPC) (2008) 'Community herbal monograph on Urtica dioica L.; Urtica urens L., folium'. Available at: https://www.ema.europa.eu/en/documents/herbal-monograph/final-community-herbal-monograph-urtica-dioica-l-urtica-urens-l-folium_en.pdf Traditional / reference
https://www.ema.europa.eu/en/documents/herbal-monograph/final-community-herbal-monograph-urtica-dioica-l-urtica-urens-l-folium_en.pdf - Duke, J.A (2002) 'Handbook of Medicinal Herbs, Second Edition'. Traditional / reference
https://scholar.google.com/scholar?q=Handbook%20of%20Medicinal%20Herbs%2C%20Second%20Edition
Generated automatically from the Omnia Sana plant database and its cited sources. For educational purposes only — not medical advice. Always consult a qualified practitioner before using medicinal plants.