Guest guest Posted January 1, 2004 Report Share Posted January 1, 2004 GLA (Gamma-Linolenic Acid) Beneficial for Diabetic Neuropathy GLA -(Gamma-Linolenic Acid) Supplement Forms / Alternate Names- Omega-6 Fatty Acids; Sources of GLA include Black Currant Seed Oil, Borage Oil, Evening Primrose Oil Principal Proposed Use- • Diabetic Neuropathy --- What Is the Scientific Evidence for GLA (Gamma-Linolenic Acid)? --- -- GLA (gamma-linolenic acid) is one of the two main 'types' of essential fatty acids. These are " good " fats that are as necessary for your health as vitamins. Specifically, GLA is a Therapuetic omega-6 fatty acid. (For more information on the other major category of essential fatty acids, omega-3, see the article on fish oil.) The body uses essential fatty acids to make various prostaglandins and leukotrienes. These substances *influence* inflammation and pain; some of them increase symptoms, while others decrease them. Taking GLA may swing the balance over to the more " favorable " prostaglandins and leukotrienes, making it 'helpful' for diseases that involve inflammation. --- - -Requirements/Sources The body ordinarily makes all the GLA it needs from linoleic acid, an omega-6 essential fatty acid found in many foods. In certain circumstances, however, the body may not be able to convert linoleic acid to GLA efficiently. These include advanced age, diabetes, high alcohol intake, eczema, cyclic mastitis, viral infections, excessive saturated fat intake, elevated cholesterol levels, and deficiencies of vitamin B6, zinc, magnesium, biotin, or calcium. In such cases, taking GLA supplements may make up for a genuine deficiency. Very little GLA is found in the diet. Borage oil is the richest supplemental source (17 to 25% GLA), followed by black currant oil (15 to 20%) and evening primrose oil (7 to 10%). Borage and evening primrose are the most common sources. --- -- -Therapeutic Dosages- Diabetic neuropathy is typically treated with about 400 to 600 mg daily (about 4 to 6 g of evening primrose or 2 to 3 g of borage oil), and rheumatoid arthritis may require as much as 2,000 to 3,000 mg (best obtained from purified GLA). GLA should be taken with food. Full benefits are said to take more than 6 months to develop, so be patient. --- -- --------- Therapeutic Uses Evening primrose oil appears to be effective for diabetic neuropathy, a complication of diabetes. This condition, which develops in many people with diabetes, consists of pain and/or numbness due to progressive nerve damage. --- -- -What Is the Scientific Evidence for GLA (Gamma-Linolenic Acid)? Diabetic Neuropathy- Diabetic neuropathy is a gradual degeneration of nerves caused by diabetes. There is some evidence that GLA can be helpful, if you give it long enough to work. In one double-blind, placebo-controlled study, 111 people with mild diabetic neuropathy received either 480 mg daily of GLA or placebo.51 After 12 months, the group taking GLA was doing significantly better than the placebo group. Good results were seen in a smaller study as well. In addition, numerous studies in animals have found that evening primrose oil can protect nerves from diabetes-induced nerve injury. There is preliminary evidence that GLA may be more effective for this condition when combined with alpha lipoic acid. Rheumatoid Arthritis- According to many studies, fish oil, a source of omega-3 essential fatty acids, definitely improves symptoms of rheumatoid arthritis. A few studies suggest that GLA may also work. One double-blind study followed 56 people with rheumatoid arthritis for 6 months.66 Participants received either 2.8 g daily of GLA or placebo. The group taking GLA experienced significantly fewer symptoms than the placebo group, and the improvements grew over time. Other Proposed Uses- • GLA Alone:; Attention Deficit, Kidney Stones; PMS; Raynaud's Phenomenon; Rheumatoid Arthritis; Ulcerative Colitis; Weight Loss; and Many Others; In Combination with Fish Oil:; Attention Deficit and Hyperactivity Disorder (ADHD); Huntington's Disease; Osteoporosis -Requirements/Sources- The body ordinarily makes all the GLA it needs from linoleic acid, an omega-6 essential fatty acid found in foods. In certain circumstances, however, the body may not be able to convert linoleic acid to GLA efficiently. These include advanced age, diabetes, high alcohol intake, eczema, cyclic mastitis, viral infections, excessive saturated fat intake, elevated cholesterol levels, and deficiencies of vitamin B6, zinc, magnesium, biotin, or calcium. In such cases, taking GLA supplements may make up for a genuine deficiency. --- -- --------- Safety Issues Over 4,000 people have taken GLA or evening primrose oil in scientific studies, and no significant adverse effects have ever been noted. --- -- --------- References 1. Horrobin DF. Nutritional and medical importance of gamma- linolenic acid. Prog Lipid Res. 1992;31:163–194. 2. Horrobin DF. The use of gamma-linolenic acid in diabetic neuropathy. Agents Actions Suppl. 1992;37:120–144. 3. Horrobin DF, Stewart C. Evening primrose oil in atopic eczema. Lancet. 1990;335:864–865. 4. Horrobin DF, Manku MS, Brush M, et al. Abnormalities in plasma essential fatty acid levels in women with premenstrual syndrome and with nonmalignant breast disease. J Nutr Med. 1991;2:259–264. 5. Manku MS, Horrobin DF, Morse NL, et al. Essential fatty acids in the plasma phospholipids of patients with atopic eczema. Br J Dermatol. 1984;110:643–648. 6. Pye JK, Mansel RE, Hughes LE. Clinical experience of drug treatments for mastalgia. Lancet. 1985;2:373–377. 7. Pashby NL, Mansel RE, Hughes LE, et al. A clinical trial of evening primrose oil in mastalgia [abstract]. Br J Surg. 1981;68:801. 8. Mansel RE, Gateley CA, Harrison BJ, et al. Effects and tolerability of n-6 essential fatty acid supplementation in patients with recurrent breast cysts—a randomized double-blind placebo-controlled trial. J Nutr Med. 1990;1:195–200. 9. Mansel RE, Harrison BJ, Melhuish J, et al. A randomized trial of dietary intervention with essential fatty acids in patients with categorized cysts. Ann N Y Acad Sci. 1990;586:288–294. 10. Drug Evaluations Annual. Vol 2. Milwaukee, Wis.: American Medical Association; 1991. 11. Budeiri D, Li Wan Po A, Dornan JC. Is evening primrose oil of value in the treatment of premenstrual syndrome? Control Clin Trials. 1996;17:60–68. 12. Keen H, Payan J, Allawi J, et al. Treatment of diabetic neuropathy with gamma-linolenic acid. The gamma-Linolenic Acid Multicenter Trial Group. Diabetes Care. 1993;16:8–15. 13. Jamal GA, Carmichael H. The effect of gamma-linolenic acid on human diabetic peripheral neuropathy: a double-blind placebo-controlled trial. Diabet Med. 1990;7:319–323. 14. Morse PF, Horrobin DF, Manku MS, et al. Meta-analysis of placebo-controlled studies of the efficacy of Epogam in the treatment of atopic eczema. Relationship between plasma essential fatty acid changes and clinical response. Br J Dermatol. 1989;121:75–90. 15. Berth-Jones J, Graham-Brown RA. Placebo-controlled trial of essential fatty acid supplementation in atopic dermatitis. Lancet. 1993;341:1557–1560. 16. Hederos CA, Berg A. Epogam evening primrose oil treatment in atopic dermatitis and asthma. Arch Dis Child. 1996;75:494–497. 17. Henz BM, Jablonska S, van de Kerkhof PC, et al. Double-blind, multicentre analysis of the efficacy of borage oil in patients with atopic eczema. Br J Dermatol. 1999;140:685–688. 18. Whitaker DK, Cilliers J, de Beer C. Evening primrose oil (Epogam) in the treatment of chronic hand dermatitis: disappointing therapeutic results. Dermatology. 1996;193:115–120. 19. Tamimi NA, Mikhail AI, and Stevens PE. Role of gamma-linolenic acid in uraemic pruritus [letter]. Nephron. 1999;83:170–171. 20. Yoshimoto-Furuie K, Yoshimoto K, Tanaka T, et al. Effects of oral supplementation with evening primrose oil for six weeks on plasma essential fatty acids and uremic skin symptoms in hemodialysis patients. Nephron. 1999;81:151–159. 21. Zurier RB, Rossetti RG, Jacobson EW, et al. gamma-Linolenic acid treatment of rheumatoid arthritis. A randomized, placebo-controlled trial. Arthritis Rheum. 1996;39:1808–1817. 22. Leventhal LJ, Boyce EG, Zurier RB. Treatment of rheumatoid arthritis with blackcurrant seed oil. Br J Rheumatol. 1994;33:847– 852. 23. Leventhal LJ, Boyce EG, Zurier RB. Treatment of rheumatoid arthritis with gammalinolenic acid. Ann Intern Med. 1993;119:867– 873. 24. Rothman D, DeLuca P, Zurier RB. Botanical lipids: Effects on inflammation, immune responses, and rheumatoid arthritis. Semin Arthritis Rheum. 1995;25:87–96. 25. Belch JJ, Shaw B, O'Dowd A, et al. Evening primrose oil (Efamol) as a treatment for cold-induced vasospasm (Raynaud's phenomenon). Prog Lipid Res. 1986;25:335–340. 26. Belch JJ, Shaw B, O'Dowd A, et al. Evening primrose oil (Efamol) in the treatment of Raynaud's phenomenon: a double-blind study. Thromb Haemost. 1985;54:490–494. 27. Haslett C, Douglas JG, Chalmers SR, et al. A double-blind evaluation of evening primrose oil as an antiobesity agent. IntJObes. 1983;7:549–553. 28. Garcia CM, Carter J, Chou A. Gamma linolenic acid causes weight loss and lower blood pressure in overweight patients with family history of obesity. SwedJBiolMed. 1986;4:8–11. 29. Kenny FS, Pinder SE, Ellis IO, et al. Gamma linolenic acid with tamoxifen as primary therapy in breast cancer. Int J Cancer. 2000;85:643–648. 30. Greenfield SM, Green AT, Teare JP, et al. A randomized controlled study of evening primrose oil and fish oil in ulcerative colitis. Aliment Pharmacol Ther. 1993;7:159–166. 31. Buck AC, Jenkins A, Lingam K, et al. The treatment of idiopathic recurrent urolithiasis with fish oil (EPA) and evening primrose oil (GLA)—a double blind study. J Urol. 1993;149:253A. 32. Tulloch I, Smellie WS, Buck AC. Evening primrose oil reduces urinary calcium excretion in both normal and hypercalciuric rats. Urol Res. 1994;22:227–230. 33. Horrobin DF. Multiple sclerosis: the rational basis for treatment with colchicine and evening primrose oil. Med Hypotheses. 1979;5:365–378. 34. Field EJ, Joyce G. Effect of prolonged ingestion of gamma-linolenate by MS patients. Eur Neurol. 1978;17:67–76. 35. Bates D. Dietary lipids and multiple sclerosis. Ups J Med Sci Suppl. 1990;48:173–187. 36. Horrobin DF. Multiple sclerosis: the rational basis for treatment with colchicine and evening primrose oil. Med Hypotheses. 1979;5:365–378. 37. Behan PO, Behan WM, Horrobin D. Effect of high doses of essential fatty acids on the postviral fatigue syndrome. Acta Neurol Scand. 1990;82:209–216. 38. Warren G, McKendrick M, Peet M. The role of essential fatty acids in chronic fatigue syndrome. A case-controlled study of red-cell membrane essential fatty acids (EFA) and a placebo-controlled treatment study with high dose of EFA. Acta Neurol Scand. 1999;99:112–116. 39. Vaddadi K. Dyskinesias and their treatment with essential fatty acids: a review. Prostaglandins Leukot Essent Fatty Acids. 1996;55:89–94. 40. Kruger MC, Coetzer H, de Winter R, et al. Calcium, gamma- linolenic acid and eicosapentaenoic acid supplementation in senile osteoporosis. Aging (Milano). 1998;10:385–394. 41. Bassey EJ, Littlewood JJ, Rothwell MC, et al. Lack of effect of supplementation with essential fatty acids on bone mineral density in healthy pre- and postmenopausal women: two randomized controlled trials of EfacalW v. calcium alone. Br J Nutr. 2000;83:629–635. 42. Richardson AJ, McDaid AM, Calvin CM, et al. Reduced behavioural and learning problems in children with specific learning difficulties after supplementation with highly unsaturated fatty acids: a randomized double-blind placebo-controlled trial. Presented at: 2nd Forum of European Neuroscience Societies; July 24–28, 2000; Brighton, United Kingdom. 43. Horrobin DF, Manku MS, Brush M, et al. Abnormalities in plasma essential fatty acid levels in women with premenstrual syndrome and with nonmalignant breast disease. J Nutr Med. 1991;2:259–264. 44. Horrobin DF, Manku MS, Brush M, et al. Abnormalities in plasma essential fatty acid levels in women with premenstrual syndrome and with nonmalignant breast disease. J Nutr Med. 1991;2:259–264. 45. Pye JK, Mansel RE, Hughes LE. Clinical experience of drug treatments for mastalgia. Lancet. 1985;2:373–377. 46. Pashby NL, Mansel RE, Hughes LE, et al. A clinical trial of evening primrose oil in mastalgia [abstract]. Br J Surg. 1981;68:801. 47. Mansel RE, Gateley CA, Harrison BJ, et al. Effects and tolerability of n-6 essential fatty acid supplementation in patients with recurrent breast cysts—a randomized double-blind placebo-controlled trial. J Nutr Med. 1990;1:195–200. 48. Mansel RE, Harrison BJ, Melhuish J, et al. A randomized trial of dietary intervention with essential fatty acids in patients with categorized cysts. Ann N Y Acad Sci. 1990;586:288–294. 49. Kollias J, Macmillan RD, Sibbering DM, et al. Effect of evening primrose oil on clinically diagnosed fibroadenomas. Breast. 2000;9:35–36. 50. Budeiri D, Li Wan Po A, Dornan JC. Is evening primrose oil of value in the treatment of premenstrual syndrome? Control Clin Trials. 1996;17:60–68. 51. Keen H, Payan J, Allawi J, et al. Treatment of diabetic neuropathy with gamma-linolenic acid. The gamma-Linolenic Acid Multicenter Trial Group. Diabetes Care. 1993;16:8–15. 52. Jamal GA, Carmichael H. The effect of gamma-linolenic acid on human diabetic peripheral neuropathy: a double-blind placebo-controlled trial. Diabet Med. 1990;7:319–323. 53. Stevens EJ, Lockett MJ, Carrington AL, et al. Essential fatty acid treatment prevents nerve ischaemia and associated conduction anomalies in rats with experimental diabetes mellitus. Diabetologia. 1993;36:397–401. 54. Reichert R. Evening primrose oil and diabetic neuropathy. Q Rev Natr Med. 1995;129–133. 55. Hounsom L, Horrobin DF, Tritschler H, et al. A lipoic acid-gamma linolenic acid conjugate is effective against multiple indices of experimental diabetic neuropathy. Diabetologia. 1998;41:839–843. 56. Cameron NE, Cotter MA, Horrobin DH, et al. Effects of alpha- lipoic acid on neurovascular function in diabetic rats: Interaction with essential fatty acids. Diabetologia. 1998;41:390–399. 57. Morse PF, Horrobin DF, Manku MS, et al. Meta-analysis of placebo-controlled studies of the efficacy of Epogam in the treatment of atopic eczema. Relationship between plasma essential fatty acid changes and clinical response. Br J Dermatol. 1989;121:75–90. 58. Berth-Jones J, Graham-Brown RA. Placebo-controlled trial of essential fatty acid supplementation in atopic dermatitis. Lancet. 1993;341:1557–1560. 59. Biagi PL, Bordoni A, Hrelia S, et al. The effect of gamma- linolenic acid on clinical status, red cell fatty acid composition and membrane microviscosity in infants with atopic dermatitis. Drugs Exp Clin Res. 1994;20:77–84. 60. Hederos CA, Berg A. Epogam evening primrose oil treatment in atopic dermatitis and asthma. Arch Dis Child. 1996;75:494–497. 61. Henz BM, Jablonska S, van de Kerkhof PC, et al. Double-blind, multicentre analysis of the efficacy of borage oil in patients with atopic eczema. Br J Dermatol. 1999;140:685–688. 62. Berth-Jones J, Graham-Brown RA. Placebo-controlled trial of essential fatty acid supplementation in atopic dermatitis. Lancet. 1993;341:1557–1560. 63. Whitaker DK, Cilliers J, de Beer C. Evening primrose oil (Epogam) in the treatment of chronic hand dermatitis: disappointing therapeutic results. Dermatology. 1996;193:115–120. 64. Tamimi NA, Mikhail AI, Stevens PE. Role of gamma-linolenic acid in uraemic pruritus [letter]. Nephron. 1999;83:170–171. 65. Yoshimoto-Furuie K, Yoshimoto K, Tanaka T, et al. Effects of oral supplementation with evening primrose oil for six weeks on plasma essential fatty acids and uremic skin symptoms in hemodialysis patients. Nephron. 1999;81:151–159. 66. Zurier RB, Rossetti RG, Jacobson EW, et al. gamma-Linolenic acid treatment of rheumatoid arthritis. A randomized, placebo-controlled trial. Arthritis Rheum. 1996;39:1808–1817. 67. Leventhal LJ, Boyce EG, Zurier RB. Treatment of rheumatoid arthritis with blackcurrant seed oil. Br J Rheumatol. 1994;33:847– 852. 68. Leventhal LJ, Boyce EG, Zurier RB. Treatment of rheumatoid arthritis with gammalinolenic acid. Ann Intern Med. 1993;119:867– 873. 69. Rothman D, DeLuca P, Zurier RB. Botanical lipids: Effects on inflammation, immune responses, and rheumatoid arthritis. Semin Arthritis Rheum. 1995;25:87–96. 70. Belch JJ, Shaw B, O'Dowd A, et al. Evening primrose oil (Efamol) as a treatment for cold-induced vasospasm (Raynaud's phenomenon). Prog Lipid Res. 1986;25:335–340. 71. Belch JJ, Shaw B, O'Dowd A, et al. Evening primrose oil (Efamol) in the treatment of Raynaud's phenomenon: a double-blind study. Thromb Haemost. 1985;54:490–494. 72. Kruger MC, Coetzer H, de Winter R, et al. Calcium, gamma- linolenic acid and eicosapentaenoic acid supplementation in senile osteoporosis. Aging (Milano). 1998;10:385–394. 73. Bassey EJ, Littlewood JJ, Rothwell MC, et al. Lack of effect of supplementation with essential fatty acids on bone mineral density in healthy pre- and postmenopausal women: two randomized controlled trials of EfacalW v. calcium alone. Br J Nutr. 2000;83:629–635. 74. Richardson AJ, McDaid AM, Calvin CM, et al. Reduced behavioural and learning problems in children with specific learning difficulties after supplementation with highly unsaturated fatty acids: a randomized double-blind placebo-controlled trial. Presented at: 2nd Forum of European Neuroscience Societies; July 24–28, 2000; Brighton, United Kingdom. 75. Haslett C, Douglas JG, Chalmers SR, et al. A double-blind evaluation of evening primrose oil as an antiobesity agent. Int J Obes. 1983;7:549–553. 76. Garcia CM, Carter J, Chou A. Gamma linolenic acid causes weight loss and lower blood pressure in overweight patients with family history of obesity. Swed J Biol Med. 1986;4:8–11. 77. Horrobin DF. Nutritional and medical importance of gamma- linolenic acid. Prog Lipid Res. 1992;31:163–194. 78. Vaddadi KS. The use of gamma-linolenic acid and linoleic acid to differentiate between temporal lobe epilepsy and schizophrenia. Prostaglandins Med. 1981;6:375–379. 79. Aman MG, Mitchell EA, Turbott SH. The effects of essential fatty acid supplementation by Efamol in hyperactive children. J Abnorm Child Psychol. 1987;15:75–90. 80. Arnold LE, Kleykamp D, Votolato NA, et al. Gamma-linolenic acid for attention-deficit hyperactivity disorder: placebo-controlled comparison to D-amphetamine. Biol Psychiatry. 1989;25:222–228. 81. Vaddadi KS, Soosai E, Chiu E, et al. A randomised, placebo-controlled, double blind study of treatment of Huntington's disease with unsaturated fatty acids. Neuroreport. 2002;13:29-33. 82. Middleton SJ, Naylor S, Woolner J, et al. A double-blind, randomized, placebo-controlled trial of essential fatty acid supplementation in the maintenance of remission of ulcerative colitis. Aliment Pharmacol Ther. 2002;16:1131-1135. 83. Mansel RE, Pye KJ, Hughes LE. A controlled trial of evening primrose oil (Efamol) in cyclic premenstrual matalgia. Abstract 47. Proceedings of the 2nd International Symposium on Premenstrual, Postpartum, and Meonopausal Mood Disorders; 1987; Kiawah Island, S. 84. Preece PE, Hanslip JI, Gilbert L. Evening primrose oil (Efamol) for mastalgia. In: Horrobin DF, ed. Clinical uses of essential fatty acids. Montreal: Eden;1982. pp.147–154. 85. Blommers J, De Lange-De Klerk ES, Kuik DJ, et al. Evening primrose oil and fish oil for severe chronic mastalgia: A randomized, double-blind, controlled trial. Am J Obstet Gynecol. 2002;187:1389–1394. 86. Van Gool CJ, Thijs C, Henquet CJ, et al. Gamma-Linolenic acid supplementation for prophylaxis of atopic dermatitis—a randomized controlled trial in infants at high familial risk. Am J Clin Nutr. 2003;77:943–951. --- -- --------- Last reviewed October 2003 by HealthGate CAM Medical Review Board All HealthGate health and medical information found on this site is accredited by URAC. URAC's Health Web Site Accreditation Program requires compliance with 53 rigorous standards of quality and accountability, verified by independent audits. Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition. 2003 HealthGate Data Corp. 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