Grapefruit seed extract comes from the fruit and seeds of grapefruit, the sub-tropical citrus fruit that grows all across the world. Many cultures, from South America to Europe and Asia have used grapefruit seed extract as a tool to cleanse harmful organisms, among many other health benefits. 
Why is Grapefruit Seed Extract So Powerful?
Grapefruit seed extract is rich in nutrients and phytochemicals. It's a great source of plant antioxidants; one of which includes hesperidin, a natural immune system stimulator.   Grapefruit seed extract also contains vitamin C, sterols, tocopherols, citric acid, limonoids, and trace minerals.
Grapefruit Seed Extract and Harmful Organisms
Multiple studies have found grapefruit seed extract to be effective against most types of internal and external harmful organisms, including candida.  Grapefruit seed extract is gentle enough to use as a wash for fruits and vegetables, but strong enough to replace chlorine as a water purification agent.   Very few other natural substances can compare.
Other Health Benefits of Grapefruit Seed Extract
Grapefruit seed extract has a multitude of uses and just as many benefits...
- Encourages wounds to heal.
- Supports normal lipid profiles, likely due to the presence of naringin. 
- Excellent remedy for toenail fungus. 
- Effective, natural preservative for cosmetics.
- Encourages heart health. 
- Helps alkalize the body.
- Useful for pets, can be used to discourage fleas and skin conditions.
- Skye Weintraub. The Parasite Menace. p.160.
- Armando C, Maythe S, Beatriz NP. Antioxidant activity of grapefruit seed extract on vegetable oils. Journal of the Science of Food and Agriculture 77 (4): 463–7. 10.1002/(SICI)1097-0010(199808)77:4<463::AID-JSFA62>3.0.CO;2-1.
- Earl Mindell. Earl Mindell's Supplement Bible. p. 69.
- Heggers JP1, Cottingham J, Gusman J, Reagor L, McCoy L, Carino E, Cox R, Zhao JG. The effectiveness of processed grapefruit-seed extract as an antibacterial agent: II. Mechanism of action and in vitro toxicity. J Altern Complement Med. 2002 Jun;8(3):333-40.
- Donald Goldberg, Arnold Gitomer, Robert Abel. The Best Supplements for Your Health. p.185.
- Gorinstein S, Leontowicz H, Leontowicz M, et al. Changes in plasma lipid and antioxidant activity in rats as a result of naringin and red grapefruit supplementation. J. Agric. Food Chem. 53 (8): 3223–8.
- Cerda JJ, Robbins FL, Burgin CW, Baumgartner TG, Rice RW. The effects of grapefruit pectin on patients at risk for coronary heart disease without altering diet or lifestyle. Clin Cardiol 11 (9): 589–94.
†Results may vary. Information and statements made are for education purposes and are not intended to replace the advice of your doctor. If you have a severe medical condition or health concern, see your physician.