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Proof! is an independent testing service for the consumer of alternative and complementary health remedies and products, such as supplements and herbs, as well as eco and 'green' products and services. Its tests establish the active ingredients in products - which can differ dramatically from the claims made on the labels - as well as their reliability, shelf life and usability.

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The best garlic supplements

No other herb has served as many culinary and medicinal roles in as many cultures as garlic (Allium sativum L). Indeed, over the past 20 years, there have been more than 2000 papers published on garlic chemistry, pharmacology and clinical applications (Koch HP and Lawson LD, Garlic: The Science and Therapeutic Application of Allium sativum L. and Related Species, Baltimore: Williams & Wilkins, 1996).

Garlic is rich in antioxidant phytochemicals such as organosulphur compounds and flavonoids, both capable of scavenging tissue-damaging free radicals (Cancer J, 1990; 3: 20-1). Although the mechanisms of all garlic components are not known, many of its heart-protective, anticancer, anti-inflammatory and antiageing effects are thought to be due to these antioxidant actions (Planta Med, 1994; 60: 417-20; Planta Med, 1992; 58: 468-9; J Pharm Pharmacol, 1993; 49: 908-11; Neurochem Int, 1996; 29: 135-43).

Science has focused particularly on the po...

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