Plant Comparison

Flaxseed vs Dog-rose

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.

First plant
Second plant
Show:
Plant AFlaxseedLinum usitatissimumLinaceaeFull monograph →
Plant BDog-roseRosa caninaRosaceaeFull monograph →

At a glance

Flaxseed and Dog-rose: they share 5 indicated uses (arthritis / joint pain, cancer (anticancer research), inflammation (general), …); 3 pharmacological actions in common.

FlaxseedDog-rose
Constituents44
Pharmacological actions43
Indicated uses87
Safety notes42
Cited sources2023
Indicated uses
Only Flaxseed
BloatingCardiovascular / heart healthIndigestion
Shared (5)
Arthritis / joint painCancer (anticancer research)Inflammation (general)Metabolic supportSkin irritation
Only Dog-rose
Cognitive functionUrinary tract infection (UTI)
Pharmacological actions
Only Flaxseed
Digestive aid
Shared (3)
Anti-inflammatoryAnticancer (preclinical)Antioxidant
Only Dog-rose
none

Evidence face-off — shared uses

ConditionFlaxseedDog-roseVerdict
Arthritis / joint pain3/1010/10Stronger for Dog-rose
Cancer (anticancer research)7/102/10Stronger for Flaxseed
Inflammation (general)3/108/10Stronger for Dog-rose
Metabolic support6/107/10Comparable evidence
Skin irritation3/107/10Stronger for Dog-rose

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

Lignans (secoisolariciresinol diglucoside, SDG)[3]

Flax is the richest dietary source of SDG-type lignans, converted by gut bacteria to the mammalian lignans enterodiol and enterolactone; studied for antioxidant and hormone-modulating activity.

Lignans
Alpha-linolenic acid (omega-3 fatty acid)[2, 5]

The dominant fatty acid of the seed oil (~50-55% of total oil), a plant-based omega-3 studied for cardiovascular and anti-inflammatory effects.

Mucilage polysaccharides[5]

Concentrated in the seed coat; gives flaxseed its demulcent, laxative, bulk-forming action.

MucilagePolysaccharides
Cyanogenic glycosides (linamarin, linustatin)[7]

Present at low levels; cooking/roasting reduces them to negligible amounts in normal food use - a theoretical concern only at high raw intakes.

Glycosides
Vitamin C and carotenoids[5, 13]

The hip is exceptionally rich in vitamin C and carotenoids, underpinning its traditional tonic use. Quantified in commercial dried fruit at beta-carotene 7.25 mg/100 g and lycopene 2.34 mg/100 g fresh weight.

Carotenoids
Galactolipid (GOPO)[2]

A specific galactolipid fraction studied as the likely active anti-inflammatory constituent in osteoarthritis trials of standardised rosehip powder.

Flavonoids and tannins[4, 14]

Contribute to antioxidant activity. Leaves carry a higher total phenolic, flavonoid and phenolic-acid content than the hips, and leaf infusions were the only preparation to show antibacterial activity in vitro.

FlavonoidsTannins
Seed oil (unsaturated fatty acids, tocopherols, phytosterols)[15]

Cold-pressed rose hip seed oil is high in linolenic acid, with phytosterols up to 6485 mg/kg, tocopherols up to 1125 mg/kg and carotenoids up to 108 mg/kg; p-coumaric acid methyl ester predominates among its phenolics.

Phytosterols

Pharmacological Actions

Anti-inflammatory[2, 4, 5, 8, 9, 12, 14, 15, 16, 18]
Anticancer (preclinical)[7]
Antioxidant[3, 5, 7, 12, 14, 15, 16, 18]
Digestive aid[2, 4, 12, 14, 15, 16, 18]
Anti-inflammatory[1, 2, 16, 17, 18]

In vitro, the lipophilic (n-hexane and dichloromethane) rose hip extracts inhibited COX-1, COX-2 and 5-LOX-mediated leukotriene B4 formation; the aqueous and methanol extracts were inactive.

Anticancer (preclinical)[4]
Antioxidant[2, 4, 5, 6, 7, 9, 13, 14, 16, 17, 18]

Traditional & Indicated Uses

Arthritis / joint pain[12, 14, 15, 16, 18]Limited · 3/10

inferred from anti-inflammatory action

Evidence: 3
Label: Arthritis / joint pain
Bloating[12, 14, 15, 16, 18]Limited · 3/10

inferred from digestive action

Evidence: 3
Label: Bloating
Cancer (anticancer research)[7]Good · 7/10

inferred from anticancer action

Evidence: 7
Label: Cancer (anticancer research)
Cardiovascular / heart health[12, 13, 14, 15, 16, 18]Moderate · 6/10
Evidence: 6
Label: Cardiovascular / heart health
Indigestion[12, 14, 15, 16, 18]Limited · 3/10

inferred from digestive action

Evidence: 3
Label: Indigestion
Inflammation (general)[12, 14, 15, 16, 18]Limited · 3/10

inferred from anti-inflammatory action

Evidence: 3
Label: Inflammation (general)
Metabolic support[12, 14, 15, 16, 17, 18]Moderate · 6/10
Evidence: 6
Label: Metabolic support
Skin irritation[12, 14, 15, 16, 18]Limited · 3/10

inferred from anti-inflammatory action

Evidence: 3
Label: Skin irritation
Arthritis / joint pain[1, 2, 16, 17, 19, 20]Strong · 10/10

Two placebo-controlled crossover RCTs of standardised rosehip powder (5 g/day) report reduced WOMAC pain and reduced rescue-medication use in knee/hip osteoarthritis, consistent with the existing meta-analysis.

Evidence: 10
Label: Arthritis / joint pain
Cancer (anticancer research)[4]Traditional · 2/10

inferred from anticancer action

Evidence: 2
Label: Cancer (anticancer research)
Cognitive function[21]Traditional · 2/10

Animal evidence only. In high-fat-diet/streptozotocin diabetic rats, R. canina ethanol extract (250 mg/kg) improved recall and long-term memory and reduced hippocampal insulin resistance, amyloid-beta and acetylcholinesterase activity. No human data; the effect is reported in a diabetes model, not in healthy or cognitively impaired people.

Evidence: 2
Label: Cognitive function
Inflammation (general)[2, 16, 17]Good · 8/10

inferred from anti-inflammatory action

Evidence: 8
Label: Inflammation (general)
Metabolic support[3, 6, 16, 17, 21]Good · 7/10
Evidence: 7
Label: Metabolic support
Skin irritation[8, 16, 17]Good · 7/10

inferred from anti-inflammatory action

Evidence: 7
Label: Skin irritation
Urinary tract infection (UTI)[22]Moderate · 5/10

One triple-blind placebo-controlled RCT (n=400) found that 500 mg R. canina fruit capsules twice daily for 20 days after caesarean section reduced the incidence of urinary tract infection. The incidence of cystitis specifically did not differ significantly between groups. Prevention in a post-surgical population; not evidence for treating an established UTI.

Evidence: 5
Label: Urinary tract infection (UTI)

Safety, Cautions & Contraindications

Safety note[12, 13, 14, 15, 16, 17, 18]Info

Flaxseeds are safe for most people at recommended food amounts (1–2 tablespoons ground/day). They must be ground or milled to be bioavailable — whole seeds largely pass through the gut undigested. High fibre content may cause bloating, flatulence, and loose stools, especially if fibre intake is increased rapidly without adequate hydration. Flaxseeds contain cyanogenic glycosides (linamarin, linustatin); cooking or roasting reduces these to negligible levels in normal food amounts. Raw seeds in very large quantities are a theoretical concern, but typical use is safe (EFSA, 2017).

Safety note[12, 13, 14, 15, 16, 17, 18]Caution

Medication interactions: Flaxseed may reduce absorption of oral medications if taken simultaneously — space flaxseed supplementation 1–2 hours from medications. Omega-3 ALA and lignans may mildly enhance anticoagulant/antiplatelet effects; use caution with blood thinners. Some sources suggest caution with hormone-sensitive conditions due to phytoestrogen (lignan) content, though dietary amounts are unlikely to pose risk (Adolphe et al., 2010).

Safety note[12, 13, 14, 15, 16, 17, 18]Caution

Pregnancy: Food amounts are generally considered safe; high-dose supplements should be discussed with a clinician due to limited safety data.

Safety note[12, 13, 14, 15, 16, 17, 18, 20]Info

Duke (2002) rates flaxseed as +++ with clinical evidence (score 2) for antiatherogenic, hypocholesterolemic, laxative, lipolytic (fat-dissolving), and demulcent activities. Flaxseed's omega-3 fatty acids (ALA) and lignans are associated with reduced cardiovascular risk. Commission E approves flaxseed as a laxative and for mucilaginous protection of inflamed gastrointestinal mucosa. Dose: 1–2 tablespoons ground seed with ample water, twice daily. Whole seeds should be chewed or ground for full medicinal effect. Cyanogenic glycosides are present but at safe levels in normal dietary amounts (Duke, 2002).

Safety note[16, 17]Info

Rosa canina (dog rose) hips are generally recognized as safe (GRAS) for consumption, widely used in teas, jams, and supplements. They are highly nutritious but may cause minor digestive upset (nausea, diarrhea) in some users. The small, irritating hairs around the seeds should be removed before consumption.

Safety note[16, 17, 23]Info

Duke (2002) rates dog rose hips as +++ with clinical evidence (score 2) for astringent activity and experimental support for antioxidant and diuretic effects. Dog rose hips are exceptionally rich in vitamin C and bioflavonoids. They are traditionally used for cold and influenza prevention, urinary tract health, and mild diarrhea. Duke notes the diuretic (score 1) and lipoxygenase-inhibitory activities as experimentally documented. The fruit is considered food-grade safe (Duke, 2002).

External Ids

Gbif: 2873861
Wikidata: Q45108
Gbif: 3002461
Wikidata: Q146066

Botanical Description

Erect annual herb, slender and often branched near the top, growing 30-80 (up to 100) cm tall from a fine taproot. Leaves are alternate, sessile, narrowly lanceolate to linear, blue-green and entire-margined. Flowers are pale blue (occasionally white or pink), five-petalled and borne on slender stalks in loose terminal cymes. The fruit is a small globular capsule ('boll') that splits into ten compartments, each containing one flattened, glossy, red-brown seed.[5]

Height: 30-80 (up to 100) cm
Habit: Erect, slender annual herb
Leaves: Alternate, sessile, narrowly lanceolate to linear, blue-green, entire
Flowers: Pale blue (occasionally white or pink), five-petalled, in loose terminal cymes
Stem: Slender, erect, often branched above
Root: Fine taproot
Fruit: Globular capsule ('boll') splitting into ten compartments, each with one flattened glossy red-brown seed
Flowering Period: June-August

Scrambling, thorny deciduous shrub (Rosaceae), 1-5 m, with arching, prickly stems bearing hooked thorns. Leaves are pinnate with 5-7 oval, toothed leaflets. Pale pink to white, five-petalled flowers are followed by bright red-orange, egg-shaped hips (the fleshy hip is an accessory fruit; the true fruits are small hairy achenes inside it) that ripen in autumn and often persist into winter.[2]

Height: 1-5 m
Habit: Scrambling, thorny deciduous shrub
Leaves: Pinnate, 5-7 oval, toothed leaflets
Flowers: Pale pink to white, five-petalled
Stem: Arching, prickly, with hooked thorns
Root: Deep, woody root system
Fruit: Bright red-orange, egg-shaped hip (accessory fruit) containing small hairy achenes
Flowering Period: June-July; hips ripen August-October

Habitat

Native to the Mediterranean region and the Fertile Crescent, cultivated since prehistory for fibre and oil and now grown worldwide in temperate regions with well-drained, fertile soils and a cool, moist growing season; occasionally found as a naturalised escape on waste and cultivated ground.[5]

Native throughout Europe, north-west Africa and western Asia, common in hedgerows, woodland edges, scrub and roadside verges on a wide range of soils.[2]

Harvesting

Grown as an annual crop, seed is harvested once the capsules ('bolls') have dried and turned brown, typically in late summer, by cutting or combining the whole plant and threshing out the seed. Whole seed stores well; it should only be ground shortly before use, since the oil in ground seed oxidises and turns rancid quickly.[2]

Parts: Seed
Season: Late summer, once bolls have dried

Hips are picked in autumn once fully coloured, then dried for tea or powder, or processed fresh for syrup. The fine, irritant hairs surrounding the seeds inside the hip must be removed before consumption.[5]

Parts: Fruit (hip), Petals, Seed
Season: Autumn

Traditional Uses

Flaxseed has a long history of traditional use as a bulk-forming laxative and demulcent for constipation and irritated gut mucosa, and as a poultice for boils and inflamed skin. Modern interest centres on its lignan (secoisolariciresinol diglucoside) and alpha-linolenic acid content, studied for cardiovascular, metabolic and hormone-related outcomes.[2, 4, 5]

Rosehip has a long European folk tradition as a vitamin-C-rich tonic for colds and general immunity, and as a mild diuretic and astringent for urinary and digestive complaints. Modern clinical trials on standardised rosehip powder show a modest, reproducible benefit for osteoarthritis pain and stiffness.[1, 2]

Preparations

Ground seed ('flax meal')[2]

Whole seed freshly ground (milled) and taken with plenty of liquid, or stirred into food; grinding is needed to make the oil and lignans bioavailable, as whole seeds largely pass through the gut undigested.

Flaxseed oil[5]

Cold-pressed oil taken as a concentrated source of alpha-linolenic acid (omega-3); lacks the fibre and lignan content of the whole ground seed.

Rosehip powder (standardised, seedless)[1]

The form used in osteoarthritis clinical trials.

Dosage

Ground seed[12, 13, 14, 15, 16, 17, 18]

Traditional guidance and Duke (2002) suggest 1-2 tablespoons of ground seed with ample water, once or twice daily. Educational reference only, not a prescription.

Flaxseed oil[19]

A randomised placebo-controlled trial titrated flax oil capsules (550 mg alpha-linolenic acid per 1 g of oil) to 12 capsules per day, i.e. up to roughly 12 g of oil daily, over 16 weeks - broadly matching the 1-2 tablespoons (about 10-15 mL) daily often cited for omega-3 intake. That trial was in children and adolescents with bipolar disorder and its primary outcomes were null; it is cited here only as a source for an administered human dose of the oil, not as evidence of benefit. Note the EU herbal monograph on Lini semen covers the SEED, not the oil. Educational reference only, not a prescription.

Rosehip powder[1]

Clinical trials for osteoarthritis have most often used around 5 g/day of standardised rosehip powder. Educational reference only, not a prescription.

References

REF-2216, REF-2217, REF-2218, REF-2219, REF-2220, REF-2221, REF-2222, REF-2223, REF-2224, REF-2225, REF-0288
REF-0989, REF-0990, REF-0991, REF-0992, REF-0993, REF-0994, REF-0995, REF-0996, REF-0997, REF-0998, REF-3108, REF-3109

Lookalikes Review

Outcome: none-known
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-07
Outcome: none-known
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-07

References & Sources

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  1. Christensen, R., Bartels, E.M., Altman, R.D., Astrup, A. and Bliddal, H (2008) 'Does the hip powder of Rosa canina (rosehip) reduce pain in osteoarthritis patients? - a meta-analysis of randomized controlled trials', Osteoarthritis and Cartilage, 16(9), pp. 965-972. doi:10.1016/j.joca.2008.03.001 Meta-analysis / review
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  2. Gruenwald, J., Uebelhack, R. and More, M.I (2019) 'Rosa canina - Rose hip pharmacological ingredients and molecular mechanics counteracting osteoarthritis - A systematic review', Phytomedicine, 60, pp. 152958. doi:10.1016/j.phymed.2019.152958 Meta-analysis / review
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  3. Sanz-Lamora, H., Nicola-Llorente, M., Torres-Oteros, D., Perez-Marti, A. and others (2024) 'The Antiobesity Effects of Rosehip (Rosa canina) Flesh by Antagonizing the PPAR Gamma Activity in High-Fat Diet-Fed Mice', Molecular Nutrition & Food Research, 68(5), pp. e2300539. doi:10.1002/mnfr.202300539 Preclinical
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  4. Tumbas, V.T., Canadanovic-Brunet, J.M., Cetojevic-Simin, D.D., Cetkovic, G.S. and others (2011) 'Effect of rosehip (Rosa canina L.) phytochemicals on stable free radicals and human cancer cells', Journal of the Science of Food and Agriculture, 92(6), pp. 1273-1281. doi:10.1002/jsfa.4695 Preclinical
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  5. Pena, F., Valencia, S., Tereucan, G., Nahuelcura, J. and others (2023) 'Bioactive Compounds and Antioxidant Activity in the Fruit of Rosehip (Rosa canina L. and Rosa rubiginosa L.)', Molecules, 28(8), pp. 3544. doi:10.3390/molecules28083544 Preclinical
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  6. Hendrysiak, A., Brzezowska, J., Nicolet, N., Bocquel, D. and others (2023) 'Juice Powders from Rosehip (Rosa canina L.): Physical, Chemical, and Antiglycation Properties', Molecules, 28(4), pp. 1674. doi:10.3390/molecules28041674 Preclinical
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  7. Igual, M., Garcia-Herrera, P., Camara, R.M., Martinez-Monzo, J. and others (2022) 'Bioactive Compounds in Rosehip (Rosa canina) Powder with Encapsulating Agents', Molecules, 27(15), pp. 4737. doi:10.3390/molecules27154737 Preclinical
    https://doi.org/10.3390/molecules27154737
  8. Truong, V.L. and Jeong, W.S (2023) 'Hair Growth-Promoting Effects of Rosehip (Rosa canina L.) Seed Oil in C57BL/6 Mice', Preventive Nutrition and Food Science, 28(4), pp. 411-417. doi:10.3746/pnf.2023.28.4.411 Preclinical
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  9. Michalska-Ciechanowska, A., Brzezowska, J., Nicolet, N., Haladyn, K. and others (2025) 'Valorization of Rosehip (Rosa canina L.) Pomace Using Unconventional Carbohydrate Carriers for Beverage Obtainment', Molecules, 30(1), pp. 141. doi:10.3390/molecules30010141 Preclinical
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  10. Vlaicu, P.A., Untea, A.E., Turcu, R.P., Panaite, T.D. and Saracila, M (2022) 'Rosehip (Rosa canina L.) Meal as a Natural Antioxidant on Lipid and Protein Quality and Shelf-Life of Polyunsaturated Fatty Acids Enriched Eggs', Antioxidants (Basel), 11(10), pp. 1948. doi:10.3390/antiox11101948 Preclinical
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  11. Phetcharat, L. and Wongsuphasawat, K. and Winther, K (2015) 'The effectiveness of a standardized rose hip powder, containing seeds and shells of Rosa canina, on cell longevity, skin wrinkles, moisture, and elasticity', Clinical Interventions in Aging, 10, pp. 1849--1856. doi:10.2147/CIA.S90092 Randomized trial
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  12. Golsorkhi, H. and Montazerlotfelahi, H. and Abniki, E. and Vafaee-Shahi, M. and Kamalinejad, M. and Qorbani, M. and Bahrami, M. and Dadmehr, M (2025) 'Efficacy and safety of Rosa canina L. and a traditional polyherbal formulation syrup in children and adolescents with attention-deficit/hyperactivity disorder: a factorial randomized double-blind placebo-controlled clinical trial', Phytotherapy Research, 39(9), pp. 4116--4125. doi:10.1002/ptr.70061 Randomized trial
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  13. Miljkovi\'c, V. M. and Nikoli\'c, L. and Mrmo\v sanin, J. and Gaji\'c, I. and Mihajilov-Krstev, T. and Zvezdanovi\'c, J. and Miljkovi\'c, M (2024) 'Chemical profile and antioxidant and antimicrobial activity of Rosa canina L. dried fruit commercially available in Serbia', International Journal of Molecular Sciences, 25(5), pp. 2518. doi:10.3390/ijms25052518 Preclinical
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  14. Polumackanycz, M. and Kaszuba, M. and Konopacka, A. and Marzec-Wr\'oblewska, U. and Wesolowski, M. and Waleron, K. and Buci\'nski, A. and Viapiana, A (2020) 'Phenolic composition and biological properties of wild and commercial dog rose (Rosa canina L.) fruits and leaves', Molecules, 25(22), pp. 5272. doi:10.3390/molecules25225272 Preclinical
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  15. Grajzer, M. and Prescha, A. and Korzonek, K. and Wojakowska, A. and Dziadas, M. and Kulma, A. and Grajeta, H (2015) 'Characteristics of rose hip (Rosa canina L.) cold-pressed oil and its oxidative stability studied by the differential scanning calorimetry method', Food Chemistry, 188, pp. 459--466. doi:10.1016/j.foodchem.2015.05.034 Preclinical
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  16. Chrubasik, C., Roufogalis, B.D., Müller-Ladner, U. and Chrubasik, S (2008) 'A systematic review on the Rosa canina effect and efficacy profiles', 22(6), pp. 725--733. doi:10.1002/ptr.2400 Meta-analysis / review
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  17. Royal Botanic Gardens, Kew (n.d.). Available at: https://powo.science.kew.org Traditional / reference
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  19. Winther, K. and Apel, K. and Thamsborg, G (2005) 'A powder made from seeds and shells of a rose-hip subspecies (Rosa canina) reduces symptoms of knee and hip osteoarthritis: a randomized, double-blind, placebo-controlled clinical trial', Scandinavian Journal of Rheumatology, 34(4), pp. 302--308. doi:10.1080/03009740510018624 Randomized trial
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  20. Rein, E. and Kharazmi, A. and Winther, K (2004) 'A herbal remedy, Hyben Vital (stand. powder of a subspecies of Rosa canina fruits), reduces pain and improves general wellbeing in patients with osteoarthritis: a double-blind, placebo-controlled, randomised trial', Phytomedicine, 11(5), pp. 383--391. doi:10.1016/j.phymed.2004.01.001 Randomized trial
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  21. Ertas, B. and Hazar-Yavuz, A. N. and Topal, F. and Keles-Kaya, R. and Karakus, \"O. and Ozcan, G. S. and Taskin, T. and Cam, M. E (2023) 'Rosa canina L. improves learning and memory-associated cognitive impairment by regulating glucose levels and reducing hippocampal insulin resistance in high-fat diet/streptozotocin-induced diabetic rats', Journal of Ethnopharmacology, 313, pp. 116541. doi:10.1016/j.jep.2023.116541 Preclinical
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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.