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A compound developed as an offshoot of drug abuse research is proving effective as a memory enhancer in mice with learning impairments similar to those associated with Alzheimer 's disease . Although the Roundup label recommends a rate of 50-100 % for cut-stump treatment , a 50 % solution has proven effective . While the Roundup label recommends a 50-100 % concentration of Roundup for stump treatment , a 10-20 % concentration has proven effective .