While not inherently dangerous, too much of it can cause problems, as can too much caffeine derived from other sources.

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If the drug candidate is derived from an herbal medicine that is legally marketed and hasn't caused safety problems, it may be able to skip the early-stage safety trial and go right to midstage clinical trials, which measure efficacy and determine proper dosing.

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But if parents had just one struggling child, the resulting distress tended to overshadow the well-being and happiness they derived from their other, more successful children --especially if the child's problems were self-made rather than a case of misfortune.

CNN: When adult children fail, parents suffer too