Final answer:
The claim that 'Products marketed as GRAS are always safe to consumers' is not true. The GRAS status implies general safety but does not guarantee absolute safety in every circumstance, as the FDA can take action if new evidence emerges that suggests a GRAS substance is harmful. The correct option is 3.
Step-by-step explanation:
The statement about GRAS (Generally Recognized as Safe) products that is not true is that "Products marketed as GRAS are always safe to consumers." GRAS is a designation that indicates a substance is considered safe by experts, and therefore, is not subject to the premarket review and approval by the FDA.
However, this does not mean the products are always safe in all circumstances. The FDA can take action against any GRAS substance if new evidence suggests it is no longer safe.
For example, substances such as sugar, salt, and vinegar are classified as GRAS and are commonly used in everyday cooking. The legal status of ingredients like stevia can vary; while high-purity stevia glycoside extracts are GRAS, stevia leaf and crude extracts are not approved for use in food.
The FDA rigorously evaluates both certified and exempt color additives to ensure safety. Besides, some GRAS substances might cause problems for certain individuals despite being safe for the general population.
Thus, it's important to consider that while a GRAS designation implies general safety, there can be exceptions based on individual health issues or new scientific information. Option 3. is the correct one.