Research has shown grapefruit fiber can reduce cholesterol levels by 25-30 per cent in a month and it also appears to unclog blocked arteries. It is believed to contain a unique acid that de-furs the arteries, inhibits fat absorption and suppresses cholesterol production in a similar way to cholesterol-lowering drugs.

Good for: high cholesterol levels, clogged arteries.

Taking the supplement The standard dose is 5-15g a day. Consult your doctor if you are taking medication for heart disease.

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