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“In the fasting rat, intravenous caffeine caused an increase in the serum concentrations of glucose, urea , insulin, and free fatty acids, whereas a decrease in glucoplastic amino acids was found.”
Zeitschrift fur Ernahrungswissenschaft • 1984 | View Paper
“ Urea , methylurea and 1,3-dimethylurea inhibit reversibly these contractures as well as caffeine contractures (20 mmol.1−1, 30°C) but do not affect twitches.”