Frankincense essential oil is typically used at a 1% to 3% dilution for topical application, which translates to roughly 6 to 18 drops per ounce (30 ml) of carrier oil. The exact amount depends on where you’re applying it, your skin type, and whether you’re using it on your body, your face, or in a diffuser.
Topical Dilution by Body Area
Essential oils are concentrated plant extracts, and frankincense is no exception. Applying it undiluted (sometimes called “neat”) can irritate or damage your skin, so you’ll always mix it with a carrier oil like jojoba, sweet almond, or coconut oil before putting it on your body.
For body massage or general skin application, a 1% to 3% dilution is the standard range. This has been the working guideline in aromatherapy for over 50 years and matches the concentration of fragrance used in most commercial body care products. In practical terms:
- 1% dilution: about 6 drops of frankincense per 1 ounce (30 ml) of carrier oil
- 2% dilution: about 12 drops per ounce
- 3% dilution: about 18 drops per ounce
For facial serums and anything applied near sensitive areas like the underarms or neck, drop down to 0.5% to 1.2%. That’s 3 to 6 drops per ounce. The skin on your face is thinner and more reactive than body skin, so a lower concentration reduces your risk of redness or irritation while still delivering the oil’s properties. A 1% dilution is generally considered safe for long-term, everyday facial use.
If your skin is already reactive, damaged, or has a compromised barrier (from conditions like eczema or rosacea, or from recent chemical peels), stay at the lowest end: 0.2% to 1%, which is just 1 to 6 drops per ounce. Start with a patch test on a small area of skin and wait 24 hours before applying more broadly.
How Many Drops to Use in a Diffuser
Diffusers disperse frankincense oil into the air as a fine mist, so the amount you use depends on two things: the size of your diffuser’s water tank and the size of the room.
By tank size:
- 100 ml tank: 3 to 5 drops
- 200 ml tank: 6 to 10 drops
- 300 ml tank: 8 to 12 drops
- 400 ml tank: 10 to 15 drops
- 500 ml or larger: 12 to 20 drops
If you’re using frankincense specifically for meditation or relaxation, 4 to 7 drops is a common starting point regardless of tank size. You can always add more if the scent feels too faint after a few minutes.
Room size matters just as much as tank size. A small room (up to 150 square feet, like a bathroom or home office) only needs 3 to 5 drops. A medium room (150 to 300 square feet) works well with 5 to 10 drops. Larger open spaces may need 10 to 15 drops to produce a noticeable scent.
Run times are worth paying attention to. For small spaces, 15 to 30 minutes per session is enough. Medium to large rooms can handle 30 to 60 minutes. Don’t leave a diffuser running continuously. Cap sessions at 1 to 2 hours and take breaks between them, especially if you have pets or other people in the space who may be more sensitive to airborne oils.
Adjustments for Children and Older Adults
Children need significantly lower concentrations than adults. Their skin is thinner and more permeable, and their bodies process these compounds differently. Guidelines from the reference text “Essential Oil Safety” break it down by age:
- 3 to 24 months: 0.25% to 0.5% (1 to 3 drops per ounce of carrier oil)
- 2 to 6 years: 1% to 2% (6 to 12 drops per ounce)
- 6 to 15 years: 1.5% to 3% (9 to 18 drops per ounce)
- Over 15 years: 2.5% to 5% (15 to 30 drops per ounce)
Never apply undiluted essential oils to a child’s skin, add them to bath water without mixing them into a carrier first, or let children swallow them. Some children have experienced allergic reactions, respiratory symptoms like coughing and wheezing, or skin burns from essential oils. Always do a patch test first and keep oils away from eyes, ears, and the nose.
Older adults with thinning or fragile skin should follow the same principle as facial application: stay at or below 1%. Aging skin has reduced barrier function, making it more vulnerable to irritation.
Why You Should Never Use It Undiluted
Frankincense oil in its concentrated form can cause contact dermatitis, redness, and chemical burns. Diluting it doesn’t weaken its effectiveness for skin care or aromatherapy. It simply makes it safe to use. A 2% dilution still delivers a meaningful concentration of the oil’s active compounds to your skin, and going higher doesn’t necessarily produce better results. It just raises your risk of a reaction.
If you’ve been using frankincense at a certain dilution without problems, that’s a good sign your skin tolerates it, but sensitivity can develop over time with repeated exposure. Sticking to the recommended ranges protects you long-term.
A Note on Swallowing Frankincense Oil
The FDA lists frankincense oil (olibanum oil) as a permitted flavoring agent in food products under regulation 172.510, which is why you’ll sometimes see it in tiny amounts in commercial foods or beverages. This does not mean it’s safe to drink drops of essential oil at home. The concentrations used in food flavoring are extremely small and carefully controlled. Essential oils are highly concentrated, and swallowing them can cause nausea, damage to the lining of your mouth and throat, and toxicity. Johns Hopkins Medicine specifically warns against swallowing essential oils.
Potential Interactions With Medications
Frankincense, particularly from the Boswellia serrata species, can interfere with how your body processes certain medications. It inhibits several of the liver enzymes responsible for breaking down drugs, which means it could increase the levels of those medications in your bloodstream and amplify their effects or side effects.
The most clearly documented interaction is with warfarin, a common blood thinner. Two case reports found that taking frankincense alongside warfarin increased clotting time to potentially dangerous levels. This is likely because frankincense interferes with some of the same inflammatory pathways that warfarin targets.
Frankincense may also affect how well your gut absorbs certain medications by interfering with a transport protein that moves drugs across the intestinal lining. If you take prescription medications regularly, especially blood thinners or drugs with narrow dosing windows, it’s worth discussing frankincense use with the prescriber before adding it to your routine. This applies to oral supplements and, to a lesser extent, topical use where some absorption into the bloodstream occurs.