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Supplements are strange things.

Everyone seems to be taking them, and yet no one knows exactly what they do.

While not perfect, medical research is much better informed than that spacey hippie re-stocking the supplement aisle, who's only too happy to tell you what to buy.

In many cases, it's better to get these vitamins, herbs and extracts from foods, but if you don't have the time or energy, a pill helps.

Taking much of the current analysis into account, here are seven solid choices from Dr. Ken Spaeth, a Research Fellow at Harvard School of Public Health.

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