Thuja Plicata Wood Oil

Thuja Plicata Wood Oil and pregnancy

Not Recommended

• Absorbed into the body
• Fetal development

Thuja Plicata Wood Oil is an essential oil from Western Red Cedar used for fragrance and antimicrobial properties in cosmetics. It contains thujone, a compound with known biological activity. Essential oils containing thujone raise concerns during pregnancy due to potential neurotoxic effects. While topical absorption of essential oils is generally low, thujone can cross the placental barrier. Most aromatherapists and healthcare providers recommend avoiding thujone-containing essential oils during pregnancy as a precautionary measure, as there is insufficient safety data on topical use during pregnancy. The American Pregnancy Association suggests pregnant women avoid most essential oils, particularly those with known active compounds like thujone. While regulatory bodies don't explicitly ban this ingredient in cosmetics, the medical consensus leans toward caution with essential oils during pregnancy.

Thuja Plicata Wood Oil and breastfeeding

Caution Advised

• Passes into breast milk

Thuja oil contains thujone, which is lipophilic (fat-soluble) and could theoretically transfer into breast milk. While topical application results in minimal systemic absorption compared to oral intake, the lack of specific studies on breastfeeding safety creates uncertainty. Most lactation consultants recommend caution with essential oils applied to areas near the breast or in large quantities on skin. The primary concern is not the small amount in typical cosmetic products, but rather the cumulative exposure if multiple products contain this ingredient. There are no specific regulatory restrictions on topical use during breastfeeding, but many healthcare providers suggest choosing fragrance-free or essential oil-free products as a conservative approach, particularly for products used on large areas of skin.

Thuja Plicata Wood Oil and postpartum

Safe to Use

• Irritant
• Common allergen

For postpartum women who are not breastfeeding, Thuja oil presents primarily dermatological considerations rather than reproductive concerns. The main risks are skin irritation and potential allergic reactions, which can affect healing skin. Postpartum skin can be more sensitive due to hormonal changes, so patch testing any new essential oil-containing product is advisable. However, there are no specific contraindications for postpartum use when not breastfeeding.

Thuja Plicata Wood Oil and trying to conceive

Caution Advised

• Hormone disruptor

For women trying to conceive, the same precautions as early pregnancy apply since conception timing is uncertain. Most fertility specialists recommend avoiding ingredients during the TTC phase that would be contraindicated in pregnancy. While there is no evidence that topical thuja oil directly affects fertility, the conservative approach is to discontinue use when actively trying to conceive, particularly if using products with higher concentrations or applying to large skin areas. The theoretical concern relates to thujone's biological activity and the desire to minimize any potentially problematic exposures during the critical early weeks of pregnancy.

Thuja Plicata Wood Oil and PCOS

Safe to Use

Thuja Plicata Wood Oil has no known hormonal activity and does not interfere with androgen or estrogen pathways relevant to PCOS. Its antimicrobial properties may actually benefit PCOS-related acne. The ingredient's anti-inflammatory compounds could theoretically help with inflammatory skin conditions common in PCOS, though this has not been specifically studied. There are no concerns about this ingredient affecting insulin sensitivity or hormone balance. Women with PCOS can use products containing this ingredient without hormonal concerns, though standard precautions about skin sensitivity with essential oils still apply.

Thuja Plicata Wood Oil and general use

Safe to Use

• Common allergen
• Irritant

For the general public, Thuja Plicata Wood Oil is considered safe when used at appropriate concentrations in cosmetic products. It provides antioxidant benefits and pleasant fragrance, along with some antimicrobial properties. The primary concerns are skin irritation and allergic contact dermatitis, which affect a small percentage of users. Like most essential oils, it can be sensitizing with repeated exposure. Individuals with sensitive skin, eczema, or known fragrance allergies should exercise caution. The ingredient is permitted in cosmetics globally when used at safe levels. The EU requires labeling of certain fragrance components. For most people, products containing this ingredient are well-tolerated when used as directed.

Everything else flagged for the same profiles

• Flagged in pregnancy
• Flagged in breastfeeding
• Flagged in trying to conceive

Related ingredients

Ingredients suggested in place of Thuja Plicata Wood Oil, each one with its own page here.

• Bisabolol
• Allantoin

Ingredients that raise the same concerns.

• Arnica Montana Flower ExtractFetal development, Hormone disruptor, Passes into breast milk
• ResorcinolFetal development, Hormone disruptor, Passes into breast milk
• Thuja Occidentalis Leaf OilFetal development, Hormone disruptor, Passes into breast milk
• Laurus Nobilis OilFetal development, Hormone disruptor, Passes into breast milk
• O-PhenylphenolFetal development, Hormone disruptor, Passes into breast milk
• ChloropheneFetal development, Hormone disruptor, Passes into breast milk

Where this came from

Truva summarises published guidance from bodies including ACOG, the FDA, the EU SCCS and the Cosmetic Ingredient Review. It has no access to your medical history and it is not a substitute for your doctor, dermatologist or midwife. These assessments have not been reviewed by a clinician, and nothing here is a diagnosis or a prescription. If you are pregnant, breastfeeding or being treated for PCOS, take the ingredient list to the person looking after you.

Assessment last pulled from the ingredient database on 15 September 2026.