Natural products such as peppermint oil have many components. Menthol is the most abundant compound found in peppermint oil. Menthol can cause superficial irritation in small amounts and severe systemic symptoms in large amounts.
Menthol topical Side Effects: Common, Severe, Long Term
image.cfm?name=Astura_EaseYourPain3oz-Peta-3.9414x4.5588inch_PRINT-page-001.jpg&id=526829
Menthol Crystals. From a Cough Reliever to a Mood Enhancer.
Is Menthol Bad for You? Uses, Benefits and Side Effects - Dr. Axe
Menthol Crystals Side Effects-FOODCHEM
11 Top Peppermint Oil Side Effects You Never Knew About
Do Nasal Inhalers Have Any Harmful Side Effects? – BoomBoom Naturals
Menthol Tobacco Ban Appears Inevitable. Expect a Healthy Black Market, More Criminal Justice Inequities
Menthol: Additives in Tobacco Products, PDF, Tobacco Smoking
Are pure menthol crystals dangerous? - Quora