Abstract: The invention discloses compositions, including nutritional products and dietary supplements, comprising 1,4-dimethylpentylamine, which is a compound that occurs naturally in the geranium plant. The invention also describes methods comprising the administration of 1,4-dimethylpentylamine to mammals. The methods result in stimulation of the central nervous system, improved mood, increased vigor, increased lipolysis, increased energy expenditure, enhanced exercise performance, and/or decreased appetite. These effects influence energy balance and can promote weight loss, improve body composition, and/or promote fitness and well-being.