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The effects of acute administration of lauric acid (LA), the most abundant medium‐chain fatty acid of coconut oil, on blood pressure, heart rate and oxidative stress were investigated in spontaneously hypertensive rats (SHR). Intravenous doses of LA reduced blood pressure in a dose‐dependent fashion (1, 3, 4, 8 and 10 mg/kg) in both SHR and Wistar Kyoto rats. LA (10⁻⁸ to 3 × 10⁻³ M) induced vasorelaxation in isolated superior mesenteric artery rings of SHR in the presence (n = 7) or absence (n = 8) of functional endothelium [maximum effect (ME) = 104 ± 3 versus 103 ± 4%]. After exposure to KCl (60 mM), LA also induced concentration‐dependent vasorelaxation (n = 7) compared to that under Phe‐induced contraction (ME = 113.5 + 5.1 versus 104.5 + 4.0%). Furthermore, LA‐induced vasorelaxation in vessels contracted with S(−)‐BayK8644 (200 nM), a L‐type Ca²⁺ channel agonist (ME = 91.4 + 4.3 versus …