Bioactive, somewhat helpful substance that is not or not solely a nutrient.
The concept of "helpful" can vary such that helpful may be defined from short as well as long-term perspectives and also psychologically versus physiologically. Generally, a drug is helpful in some manner relative to associated side effects. With a toxin or poison, by contrast, either side effects somewhat overshadow benefits or, indeed, benefits may be lacking altogether. Such substances, consequently, typically would not be considered to be drugs even though they are biologically active in some manner (i.e., as leading to bodily harm).
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