Test Your Knowledge with the Mercola Quiz

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By Dr. Mercola

1 Collagen is the most common and abundant of your body’s proteins, comprising about __ percent of the total protein in your body.

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    Collagen also compises up to 80 percent of your skin, in terms of dry weight.
    Learn more.

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2 One study, which had a cohort of nearly 2.7 million children, found that those born by C-section were __ percent more likely to be diagnosed with autism.

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    Proposed reasons for this link include exposure to anesthesia drugs, preterm delivery and elevated stress responses.
    Learn more.

3 Which ailment is now the leading cause of opiod use?

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