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* 1. Do you take supplements?

Yes

No

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* 2. Do you have a sense (subjectively) that they're working (or not)?

Yes

No

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* 3. If it turned out your supplements were actually doing nothing for you, would you have any way of knowing?

Yes

No

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* 4. Have you done any blood-testing or other testing to determine whether your supplements are helping you?

Yes

No

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* 5. Which of the following have you checked in the past year?

Vitamin B12 levels

Vitamin D levels

Omega-3 fatty acids levels

Lipid panel

Thyroid panel

Inflammation test

Hormone levels

Testosterone levels

Homocysteine

CRP

Genetic testing

Other (please specify)

None of the above