Vit.C in the already constipated...?

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Vit.C in the already constipated...?Vitamin C (as ascorbic acid): Brief Functional Summary: Promotes excretion of toxic metals, essential antioxidant, supports thyroid function. Vitamin C is known to enhance the excretion of toxic metals in the gut and to protect against free radical damage.If Vit. C promotes excretion of toxic metals, how fast does it do this? In the autistic population we have many that are constipated beyond belief. Wouldn't it be better to try to clean out their colon before doing Vit.C? If they take Vit.C while constipated can't the toxins not allowed to escape with normal bowel movements be reabsorbed like with iron? http://www.scienceformulas.com/text/how_text_07.html