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Sorbitol is a synthetic sugar substitute which is classified as a sugar alcohol. It can be argued that it has no place in the human diet, much less in a child's. The ingestion of higher amounts have been linked to gastrointestinal disturbances from abdominal pain to more serious conditions such as irritable bowel syndrome.
The one clear warning on the Flinstone's Web site concerns this chemical. While it is impossible to die from consuming iron from food, e.g. spinach, ferrous fumarate is an industrial mineral and not found in nature as food. In fact, ferrous fumarate is so toxic that accidental overdose of products containing this form is "a leading cause of fatal poisoning in children under 6." The manufacturer further warns:
Keep this product out of reach of children. In case of accidental overdose, call a doctor or poison control center immediately.
HYDROGENATED SOYBEAN OIL
Finding hydrogenated oil in anything marketed to children is absolutely unacceptable. These semi-synthetic fatty acids incorporate into our tissues and have been linked to over a dozen adverse health effects, from coronary artery disease to cancer, violent behavior to fatty liver disease.
GMO CORN STARCH
While it can be argued that the amount of GMO corn starch in this product is negligible, even irrelevant, we disagree. It is important to hold accountable brands that refuse to label their products honestly, especially when they contain ingredients that have been produced through genetic modification. The 'vitamin C' listed as ascorbic acid in Flintstones is likely also produced from GMO corn. Let's remember that Bayer's Ag-biotech division, Bayer CropScience, poured $381,600 of cash into defeating the proposition 37 GMO labeling bill in California. Parents have a right to protect their children against the well-known dangers of genetically modified foods and the agrichemicals that contaminate them, don't they? GMO corn starch is GMO, plain and simple. We'd appreciate it if Bayer would label their "vitamins" accordingly.
In summary, Bayer's Flintstone's vitamin brand is far from a natural product, and the consumer should be aware of the unintended, adverse health effects that may occur as a result of using it.
-  Karen Lau, W Graham McLean, Dominic P Williams, C Vyvyan Howard. Synergistic interactions between commonly used food additives in a developmental neurotoxicity test. Toxicol Sci. 2006 Mar;90(1):178-87. Epub 2005 Dec 13. PMID: 16352620