What Are Phthalates in Candles - And Why You Should Care?

You've started reading candle labels. You're looking for cleaner ingredients, avoiding cheap grocery store "mystery candles," maybe seeking out natural wax. But there's a category of chemicals that doesn't show up on most candle labels at all, and it's one of the more important things to understand if non-toxic candle ingredients matter to you.

Phthalates. They're common in fragrance, they're largely invisible on ingredient lists, and the research around them is worth knowing. Here's what they are, why they end up in candles, and how to tell whether your candle brand takes them seriously.

What Are Phthalates, Exactly?

Phthalates (pronounced THAL-ates) are a class of synthetic chemical compounds used primarily as plasticizers—substances that make materials more flexible and durable. In the fragrance industry, they serve a different purpose: they act as solvents and fixatives that help scent molecules bind together, extend a fragrance's lifespan, and improve how it disperses into the air.

They're inexpensive and effective, which is why they're widespread. Phthalates in fragrance are found in everything from perfume and lotion to air fresheners and scented candles—often without any disclosure on the label because fragrance formulations are legally protected as trade secrets in the U.S.

The most commonly scrutinized phthalate in consumer products is diethyl phthalate (DEP), though the class includes dozens of compounds with varying levels of studied concern.

What Does the Research Show?

The science on phthalates is still developing, but regulatory agencies and independent researchers have raised consistent flags. The U.S. Centers for Disease Control (CDC) has identified phthalates as endocrine disruptors, meaning they have the potential to interfere with hormonal signaling in the body. Studies have linked certain phthalates to reproductive health concerns, thyroid disruption, and developmental effects, particularly with long-term or high-level exposure.

Are candles a significant source of exposure? That depends on several factors: how often you burn candles, the size of the space, and whether the candle uses phthalate-based fragrance oils. Burning a candle converts liquid fragrance into airborne particles that are directly inhaled, which is a more direct exposure route than skin contact. For context, our companion post, Are Scented Candles Toxic?, covers the broader air quality picture in more depth.

The honest answer is that phthalate exposure from a single candle burned occasionally is unlikely to be a significant health risk. But for people who burn candles daily, in small rooms, or with children or pets in the home, the cumulative picture matters, and choosing phthalate-free candles is a straightforward way to reduce that variable.

How to Identify Phthalate-Free Candles

When evaluating a candle, here's what to look for:

• Explicit phthalate-free claims — not just "natural" or "clean," but a specific statement about phthalates.

• Third-party standards — fragrance oils certified to IFRA (International Fragrance Association) standards are evaluated for safety, though IFRA compliance alone doesn't guarantee phthalate-free formulations.

• Wax transparency — brands that disclose their wax type tend to be more forthcoming about fragrance sourcing too. At Upsensed, every fragrance oil we use is phthalate-free and IFRA certified—and we're happy to be specific about that. You can read more about our ingredient standards on our sustainability page.

The Straightforward Takeaway

Phthalates aren't a scare story—they're a legitimate ingredient consideration that most candle brands haven't been asked to answer for. If you're already paying attention to what goes into your home, it's a reasonable question to extend to your candles.

The good news: phthalate-free fragrance oils perform beautifully. There's no trade-off between cleaner ingredients and a strong, complex scent. The two are fully compatible. This is one of the clearest differences between mass-market candles and small-batch artisan candles. Luxury Candles vs. Regular Candles breaks down exactly where those gaps show up and why they matter.

Shop luxury hand poured candles made with phthalate-free fragrance and coconut soy wax.