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<p>tolerance requirements.</p>

<p>Some examples of substances recognized as GRAS include ascorbic acid (vitamin C), citric acid, and salt, which are all commonly used in food preservation and flavoring. The concept of food additives being "generally recognized as safe" was first described in the <a href="page.php?w=Food_Additives_Amendment_of_1958">Food Additives Amendment of 1958</a>, and all additives introduced after this time had to be evaluated by new standards.</p>

<p><big>Affirmation and notification</big></p>
<p>GRAS substances can be self-affirmed</p><p>
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