To prove that Ester-C^® Topical achieves greater stability than ordinary vitamin C, scientists at Inter-Cal pioneered laboratory and analytical methods that gauge the stability of vitamin C liquids, topicals and cosmetics. Extensive accelerated tests revealed the remarkably long shelf life of the Ester-C^® Topical... and the remarkably short shelf life of ordinary vitamin C. To understand the stability concept, consider the vitamin C in your orange juice. You buy it "fresh" at the market. But as this chart shows, its vitamin C content deteriorates very rapidly. By contrast, the vitamin C in Ester-C^® Topical lasts over two years with a potency of 90%.

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