Pine Bark Extract

Pine Bark Extract

Common Names

  • French Marine Pine Bark Extract
  • Pine Bark
  • Procyanidin Oligomers
  • PCOs

For Patients & Caregivers

How It Works

Pine bark extract has not been shown to treat or prevent cancer.

Pycnogenol is derived from the bark of the French maritime pine tree. Studies have shown that it is effective in treating many inflammatory conditions, skin disorders, and poor blood circulation because of its antioxidant and antiinflammatory properties. It was also shown to be effective in treating erectile dysfunction when used in combination with L-arginine. Animal studies indicate that pycnogenol exhibits protective effects against cardiac toxicity caused by the chemotherapy drug doxorubicin, but human data is lacking.

Purported Uses
  • Chronic venous insufficiency
    Several clinical trials support this use.
  • Attention deficit hyperactivity disorder (ADHD)
    One study found pycnogenol is not effective in treating ADHD in adults.
  • Cancer prevention
    This use has not been proven by clinical studies.
  • Inflammation
    A preliminary study supports this use. More clinical trials are needed.
  • Hypertension
    There are limited clinical data showing pine bark extract can be used together with standard blood pressure medication.
  • Erectile dysfunction
    Limited studies have been conducted and more trials are needed to establish this use.
Do Not Take If
  • You have hypersensitivity to pine bark
  • You are using anticoagulant and/or antiplatelet drugs: Pine bark extract can inhibit platelet aggregation and may increase risk of bleeding when used with these drugs.
Side Effects
  • Irritability
  • Lowered energy levels
Special Point

Many pine bark extracts on the market are not standardized and the concentration of active components and bioactivities are hard to determine.

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For Healthcare Professionals

Brand Name
Scientific Name
Pinus maritima
Clinical Summary

Obtained from the bark of the French maritime pine tree, Pinus maritima, pine bark extract consists of proanthocyanidins and is marketed under the tradename Pycnogenol®.

In vitro and animal studies indicate that pine bark extract has antioxidant, anti-inflammatory (6), immunostimulant (1), and neuroprotective (31) effects. Pine bark extract may also have antiviral and antimicrobial activities. It inhibits HIV attachment and replication (15), suppresses encephalomyocarditis virus (EMV) replication (16), and represses Helicobacter pylori growth and adherence to gastric cells (17).

Pine bark extract has been studied in humans for various conditions. Preliminary research suggests that it reduces menopausal symptoms in peri-menopausal women (8), relieves symptoms of dysmenorrhea (27), and improves osteoarthritic symptoms (9) (10). It is also used to treat skin disorders such as hyperpigmentation (11), erythema (12), endometriosis (13), and systemic lupus erythematosus (14).

Pine bark extract can improve endothelial dysfunction (2) (33) and chronic venous insufficiency (5). Chewing gum containing pine bark extract may reduce gingival bleeding and plaque accumulation (19). When used in conjunction with L-arginine, Pycnogenol is effective in improving symptoms of erectile dysfunction (18) (29). Pycnogenol supplementation also enhanced memory in elderly participants (7). Studies of attention deficit hyperactivity disorder in adults and in children yielded mixed results (3) (4). A systematic review concluded that large-scale studies are needed to establish the value of Pycnogenol in the treatment of chronic disorders (34).

In vitro studies show antimetastatic effects of pine bark extract (32). Pycnogenol may also protect against cardiotoxicity caused by doxorubicin without antagonizing its cytotoxic activity (20). Preliminary findings from a study involving cancer patients suggest usefulness of pycnogenol is reducing adverse effects associated with radiotherapy and chemotherapy (30). Further research is needed.

Adverse effects may include irritability and decreased energy especially when used for ADHD.

Purported Uses
  • Attention deficit hyperactivity disorder
  • Cancer prevention
  • Chronic venous insufficiency
  • Erectile dysfunction
  • Hypertension
  • Inflammation
Mechanism of Action

The primary constituents of pine bark extracts are procyanidins and phenolic acids (35). Pine bark extract acts as an antioxidant by scavenging reactive oxygen and nitrogen species and suppressing production of peroxides (21). It increases the activities of antioxidant enzymes by increasing the intracellular glutathione levels (22). In addition to increasing NO production which induces vasodilation (2), pine bark extract also blocks the NF-kB activation stimulated by tumor necrosis factor-alpha (TNF-alpha) and inhibits production of adhesion proteins that cause inflammation and atherosclerosis (22).

An in vitro study suggests that Pycnogenol induces apoptosis in human breast cancer cells and not in normal breast cells although the mechanism is not clear (23). Other in vitro studies have also shown that it reduces neuronal apoptosis, an important feature of Alzheimer’s disease, by decreasing free radical generation (24). In animal studies, pine bark extract exhibits a protective effect on cardiotoxicity caused by antitumor drugs, such as doxorubicin, due to its ability to act as a free-radical scavenger (20).

  • Hypersensitivity to pine bark (26)
Adverse Reactions
  • May cause irritability and lower energy levels especially when used for ADHD (26).
Herb-Drug Interactions
  • Anticoagulant and/or antiplatelet drugs: Pine bark extract can inhibit platelet aggregation and may increase risk of bleeding when used with these drugs (28).
Dosage (OneMSK Only)
  1. Liu, F.J. et al. Pycnogenol enhances immune and haemopoietic functions in senescence-accelerated mice. Cell Mol Life Sci. 1998;54(10):1168-72

  2. Nishioka K, Hidaka T, Nakamura S, et al. Pycnogenol, French maritime pine bark extract, augments endothelium-dependent vasodilation in humans. Hypertens Res. Sep 2007;30(9):775-780.

  3. Trebaticka J, et al. Treatment of ADHD with French maritime pine bark extract, Pycnogenol. Eur Child Adolesc Psychiatry 2006.

  4. Arcangeli, P. Pycnogenol in chronic venous insufficiency. Fitoterapia 2000;71(3):236-44

  5. Yang HM, Liao MF, Zhu SY, Liao MN, Rohdewald P. A randomised, double-blind, placebo-controlled trial on the effect of Pycnogenol on the climacteric syndrome in peri-menopausal women. Acta Obstet Gynecol Scand. 2007;86(8):978-985.

  6. Cisar P, Jany R, Waczulikova I, et al. Effect of pine bark extract (Pycnogenol) on symptoms of knee osteoarthritis. Phytother Res. Aug 2008;22(8):1087-1092.

  7. Ni, Z. et al. Treatment of melasma with pycnogenol. Phytother Res 2002;16(6):567-71

  8. Stefanescu, M. et al. Pycnogenol efficacy in the treatment of systemic lupus erythematosus patients. Phytother Res. 2002;15(8):698-704

  9. Matsumori A, Higuchi H, Shimada M. French maritime pine bark extract inhibits viral replication and prevents development of viral myocarditis. J Card Fail. Nov 2007;13(9):785-791.

  10. Stanislavov, R and Nikolova, V. Treatment of erectile dysfunction with pycnogenol and L-arginine. J Sex Marital Ther. 2003;29(3):207-13

  11. Kimbrough, C. et al. Pycnogenol chewing gum minimizes gingival bleeding and plaque formation. Phytomedicine 2002;9(5):410-13

  12. Huynh, H.T. and Teel, R. W. Selective induction of apoptosis in human mammary cancer cells (MCF-7) by pycnogenol. Anticancer Res 2000;20(4):2417-20

  13. Peng, Q. et al. Pycnogenol protects neurons from amyloid-beta peptide induced apoptosis. Brain Res Mol Brain Res 2002;104(1):55-65

  14. MICROMEDEX(R) Healthcare Series. 120. 2004. Thomson MICROMEDEX.

  15. Pütter M, Grotemeyer KH, Würthwein G, et al. Inhibition of smoking-induced platelet aggregation by aspirin and pycnogenol. Thromb Res. 1999 Aug 15;95(4):155-61.

  16. Belcaro G, Cesarone MR, Genovesi D, et al. Pycnogenol may alleviate adverse effects in oncologic treatment. Panminerva Med. 2008 Sep;50(3):227-34.

  17. Ansari MA, Keller JN, Scheff SW. Protective effect of Pycnogenol in human neuroblastoma SH-SY5Y cells following acrolein-induced cytotoxicity. Free Radic Biol Med. 2008 Dec 1;45(11):1510-9.

  18. Wu DC, Li S, Yang DQ, Cui YY. Effects of Pinus massoniana bark extract on the adhesion and migration capabilities of HeLa cells. Fitoterapia. 2011 Dec;82(8):1202-5.

  19. Schoonees A, Visser J, Musekiwa A, Volmink J. Pycnogenol (extract of French maritime pine bark) for the treatment of chronic disorders. Cochrane Database Syst Rev. 2012 Apr 18;4:CD008294.

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