Menthol

Menthol is an isolated compound rather than a whole plant drug. Oral (lozenges): 5-10 mg per lozenge. Inhalation: 2-5 drops in steam. Internal: 0.2-0.4 mL Peppermint|peppermint oil (50-55% menthol) in enteric-coated capsules.

Key facts
Substance type	Isolated compound or extract, not a whole plant drug

Names and identification

Language	Name
English	Menthol

What is it made of?

Key Active Markers

Derived from constituent herbs (see individual herb profiles)
Standardized on primary bioactive markers

Analytical Methods: HPLC fingerprinting, TLC (identity), LC-MS/MS (marker quantification)

Dosage forms and preparation

Dosage Forms: Crystals (topical), Essential oil, Inhalation preparation, Lozenges, Topical balm/ointment, Gel, Nasal spray, Oral thin films, Transdermal patches

Standard Dosage: Topical: 1-10% in formulations. Oral (lozenges): 5-10 mg per lozenge. Inhalation: 2-5 drops in steam. Internal: 0.2-0.4 mL peppermint oil (50-55% menthol) in enteric-coated capsules.

Bioavailability: Excellent bioavailability via all routes. Oral: approximately 40-50% bioavailable with significant first-pass hepatic glucuronidation. Topical: rapidly penetrates skin reaching dermal tissue within 5-10 minutes. Inhalation: near-instant mucosal absorption with rapid onset of action. TRPM8 receptor activation occurs at sub-micromolar concentrations making menthol highly potent topically.

Optimal Timing: Topical: as needed for pain or cooling. Lozenges: as needed for throat/nasal congestion. Enteric capsules: 30 minutes before meals for IBS. Inhalation: as needed for respiratory relief.

Standardized Extract: Natural L-Menthol crystals (minimum 99.0% purity, BP/USP grade). Dementholized peppermint oil (menthol removed, remaining terpenes). Menthol-in-cyclodextrin complex for controlled release. Microencapsulated menthol for extended topical effect.

Shelf Life: Menthol crystals: 60 months in sealed containers. Topical products: 24-36 months. Lozenges: 24 months. Essential oil: 36 months sealed.

Storage: Store menthol crystals in airtight glass containers at 15-25 deg C (sublimes at higher temperatures). Protect from heat and light. Essential oil in amber glass, tightly sealed. Topical products at room temperature. Lozenges in individually wrapped, moisture-proof packaging.

Marker Compounds: L-Menthol, Menthone, Menthyl acetate, Isomenthone, Neomenthol, Pulegone (impurity, must be below 1%)

Extraction Methods

Fractional distillation of peppermint oil (Mentha piperita/M. arvensis)
Crystallization from cornmint oil at -22 deg C
Synthetic production from thymol or citronellal
Semi-synthetic from natural d-limonene
Freeze crystallization for pharmaceutical-grade crystals

Synergistic Combinations

Camphor (counter-irritant analgesic combination)
Methyl salicylate (pain relief synergy in balms)
Eucalyptus oil (respiratory decongestant)
Capsaicin (hot-cold analgesic therapy)
Mentha piperita oil (complete peppermint spectrum)

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