Diet pills can be a dangerous weight loss strategy because . they are not tested as thoroughly as over-the-counter and prescription drugs
they can have very severe side effects
they are not tested as thoroughly as over-the-counter and prescription drugs, and they can have very severe side effects
not all of their effects are known before public availability
All of the above are correct.

 they are not tested as thoroughly as over the counter and prescription drugs  they can have very severe side effects  and not all of their effects are known before public availability.

Explanation:

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they are not tested as thoroughly as over-the-counter and prescription drugs, and they can have very severe side effects

Explanation:

they are not tested as thoroughly as over-the-counter and prescription drugs, they can have very severe side effects, and not all of their effects are known before public availability.

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