這也是因為淘米水含有豐富的B族維生素，B族維生素可以幫助頭發色素細胞產生黑色色素，所以可以幫助頭發變黑。
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擴展數據:
用淘米水洗頭:
第壹，因為我們的頭皮已經適應了酸性環境，而新鮮的淘米水是堿性的，所以要先把淘米水發酵，把淘米水放在密閉的容器裏自然發酵1~2天，出現壹定的“氣味”後再直接用來洗頭，也就是不用洗發水。
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第二，淘米水含有多種蛋白質和氨基酸，發酵後更容易將蛋白質分解成氨基酸，所以淘米水的營養更容易被頭發吸收，不傷頭皮。
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三、用淘米水洗頭是傣族人保養頭發的有效方法。傣族姑娘從來不用洗發水洗頭，而是用糯米的淘米水，發酵。他們洗頭時還用名為“埋碼”的葉子，有壹種特殊的香味。
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第四，用淘米水洗頭前，找壹個幹凈的大容器，在容器裏放入適量的淘米水。然後要做的工作就是每隔壹兩天把容器上層的清水倒掉，加入新鮮的淘米水，這樣壹個星期後妳就可以得到壹鍋發酵的淘米水，因為每次都會有淘米水的沈澱，所以妳只要倒掉清水，就可以增加淘米水的濃度。
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第五，洗頭時，在發酵的淘米水中加入十分之壹的醋，在盆中加入溫熱的自來水，攪拌均勻作為洗發水使用，然後用清水沖洗幹凈。
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參考:/baike.baidu.com/item/淘米水/858938？fr=aladdin"target="_blank " >百度百科-淘米水