Polls
| Yes, 400 mcg/day | |
| Yes, 1000 mcg/day | |
| Yes, 5000 mcg/day | |
| Yes, 6000 mcg/day (or more) | |
| No, I do not | |
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| Yes, 400 mcg/day | |
| Yes, 1000 mcg/day | |
| Yes, 5000 mcg/day | |
| Yes, 6000 mcg/day (or more) | |
| No, I do not | |
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