A 28-day feeding study with methyl isoeugenol in rats

Area of Science:

• Toxicology
• Pharmacology
• Rodent Studies

Background:

• Methyl isoeugenol is a naturally occurring compound found in various essential oils.
• Understanding the toxicological profile of methyl isoeugenol is crucial for safety assessments.

Purpose of the Study:

• To evaluate the potential adverse effects of dietary methyl isoeugenol administration in Sprague-Dawley rats.
• To determine the no-observed-adverse-effect level (NOAEL) of methyl isoeugenol.

Main Methods:

• Rats (16 males, 16 females per group) were administered methyl isoeugenol in their diet at doses of 30, 100, or 300 mg/kg body weight/day for at least 28 days.
• Control groups received the standard rodent diet.
• Body weight, general health, food intake, hematology, serum chemistry, urinalysis, and histopathology were assessed.

Main Results:

• No adverse effects on growth, general health, or food intake were observed across all dose groups.
• Slight increases in liver weight and white blood cell counts (lymphocytes, total white blood cells) were noted in the high-dose (300 mg/kg) group.
• Minor variations in serum chemistry and urine analyses were not considered treatment-related.
• Histopathological examination revealed no significant treatment-related abnormalities, with observed kidney and Harderian gland lesions deemed spontaneous.

Conclusions:

• Dietary administration of methyl isoeugenol up to 300 mg/kg body weight/day did not induce significant adverse toxicological effects in rats.
• The observed increases in liver weight and white blood cell counts at the highest dose are not considered adverse effects.
• Methyl isoeugenol appears to have a favorable safety profile based on this 28-day rodent study.