Camphor (Monoterpenone · Topical Counterirritant · Decongestant · Antifungal)
| Compound | Camphor (d-Camphor) |
| Chemical class | Terpenoid — Monoterpenone (Bicyclic) |
| CAS | 76-22-2 |
| Primary source | Cinnamomum camphora (camphor laurel), Rosmarinus officinalis |
| Key applications | Topical counterirritant, analgesic, respiratory decongestant, antifungal |
| Claim strength | High (OTC drug approval) / Moderate (antifungal) |
| Typical form | Camphor extract (water-soluble, powder, oil-soluble); pharmaceutical camphor USP |
| Buy from Herbuno | Camphor Extract Powder - Cinnamomum Camphora → |
Name origin: From Arabic kafur via Medieval Latin camphora. d-Camphor (the natural (+) enantiomer from C. camphora) has been traded globally for over 2,000 years. Traditional use: Camphor has extensive traditional use in Ayurveda (Karpura), TCM (Zhang Nao), and Middle Eastern medicine for topical analgesic, respiratory decongestant, antimicrobial, and ceremonial applications. Research trajectory: Camphor’s pharmacology is well-characterised as a TRPV1 and TRPM8 modulator. It holds OTC drug approval as a topical external analgesic (3–11%) and respiratory decongestant in multiple markets. Commercial source: Available in multiple extract formats from Cinnamomum camphora including water-soluble, dry powder, and oil-soluble. See sourcing options below.
Evidence for Camphor Applications
Topical counterirritant and analgesic (OTC): FDA-approved OTC external analgesic (3–11% camphor). TRPV1 activation produces warmth sensation; TRPM8 activation at lower concentrations produces cooling. Both produce sensory distraction from underlying pain. Multiple human studies confirm musculoskeletal pain relief comparable to low-dose topical NSAIDs. Claim strength: High.
Respiratory decongestant (OTC): Camphor vapour inhalation reduces nasal airway resistance and subjective congestion. Approved OTC decongestant active in vapour rub formulations (Vicks VapoRub composition: camphor 4.8% + menthol + eucalyptol). Human studies confirm symptomatic relief from upper respiratory infections. Claim strength: High.
Antifungal: Demonstrates activity against Candida, Aspergillus, and dermatophytes in vitro. Active component in some nail fungus topical preparations. Claim strength: Moderate.
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Dosage & Formulator Specification
Topical analgesic: 3–11% camphor (FDA-approved range). Below 3% inactive; above 11% not approved OTC — increased neurotoxicity risk with high dermal absorption. Vapour rub: 4.8% camphor (Vicks specification) with menthol and eucalyptol. CRITICAL SAFETY NOTE: camphor is toxic when ingested. Even 1–2 g orally can cause seizures and serious toxicity in adults; paediatric oral exposure is a medical emergency. All camphor formulations must be clearly labelled "for external use only" with child-resistant packaging. Herbuno camphor extracts are for topical and aromatherapy formulations only.
Frequently Asked Questions — Camphor
Is camphor safe in topical formulations for children?
FDA advises against camphor application to the face or nostrils of children under 2 years. For older children, 3–4.7% in vapour rub applied to chest or back only is acceptable as directed. Child-resistant packaging is mandatory for all camphor products.
What is the difference between natural and synthetic camphor?
Natural d-camphor from C. camphora is the (1R,4R)-(+) enantiomer with a characteristic fresh aroma. Synthetic camphor is typically racemic (dl-camphor from α-pinene synthesis). Both are pharmacologically active as counterirritants. For natural labelling, specify Cinnamomum camphora source and confirm optical rotation [α]D +41° to +43° on CoA.
Is camphor used in Ayurvedic supplements?
Traditional Ayurvedic preparations use camphor at very low doses (1–5 mg per tablet) in compound formulations for digestive and respiratory use. At trace doses, systemic exposure is minimal. Standalone camphor oral supplements are not permitted in EU or US markets.
Can camphor be combined with menthol and eucalyptol in a vapour rub?
Yes — this is the classic Vicks VapoRub formulation (camphor 4.8% + menthol 2.6% + eucalyptol 1.2% in petrolatum base). All three are OTC-approved drug actives for this application. Formulators should verify OTC drug registration requirements in target markets as this combination triggers pharmaceutical rather than cosmetic regulatory pathways.
Related compounds: Menthol, Eucalyptol, Borneol, Thymol
Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.
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