Isoflavones, a type of phytoestrogen, are found in soy protein. Most traditional standard diets have soybean meal as a major ingredient, and therefore are a significant source of isoflavones. Please refer to FAQ section for more information about phytoestrogens.

In contrast, casein-based purified diets such as AIN-76A, AIN-93G, AIN-93M, and formulas with similar ingredients, are essentially free of isoflavones. This type of diet is sometimes used for research that requires a minimal isoflavone background. This type of diet can be used as the background to which isoflavones such as genistein (supplied by the customer) can be added.

An alternative to a purified, casein-based diet is a natural ingredient diet from our global rodent diet line. Several diets in this line contain minimal isoflavone/phytoestrogen levels and are commonly used for research that requires a minimal isoflavone/phytoestrogen background. This type of diet can also be used as the background to which isoflavones such as genistein (supplied by the customer) can be added.

异黄酮是一种植物雌激素，存在于大豆蛋白中。大多数传统的标准饮食都以豆粕为主要成分，因此是异黄酮的重要来源。有关植物雌激素的更多信息，请参阅常见问题部分。

相比之下，基于酪蛋白的纯化饮食，如 AIN-76A、AIN-93G、AIN-93M 和具有类似成分的配方食品，基本上不含异黄酮。这种类型的饮食有时用于需要最低异黄酮背景的研究。这种类型的饮食可用作添加异黄酮（如染料木黄酮（由客户提供））的背景。

我们全球啮齿动物饮食系列的天然成分饮食是纯化的、以酪蛋白为基础的饮食的替代品。该系列中的几种饮食含有最低的异黄酮/植物雌激素水平，通常用于需要最低异黄酮/植物雌激素背景的研究。这种类型的饮食也可以用作添加异黄酮如染料木黄酮（由客户提供）的背景。

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