Are Paraffin Candles Safe? What the Science Says About Paraffin vs. Soy
Paraffin candles are often described as toxic, while soy candles are presented as the only responsible choice. The available research supports a more measured conclusion.
Based on the available research, well-made paraffin candles can generally be used safely in the home when burned correctly. Soy wax also has useful qualities, but the wax label alone does not determine candle performance or indoor air impact.
Wick design, fragrance composition, flame stability, ventilation, and burn time all matter.
This article is for general information only and is not medical advice. Individual sensitivities vary — if you have asthma, allergies, or respiratory conditions, talk to a healthcare professional about what's right for you.
Candle Connoisseur Club uses a paraffin-soy wax blend in its hand-poured candles. The blend supports a steady burn, strong fragrance delivery, and a 90+ hour burn time in the 24 oz Signature Pillar Candles.
The practical question is not whether paraffin is automatically dangerous. It is whether the candle is properly made and properly used.
The short answer
The studies cited below suggest paraffin candles can be used safely for normal household use when they are well made, burned as directed, and used in a ventilated room.
Research has found that:
- Paraffin, soy, palm, stearin, and beeswax candles can produce similar combustion byproducts under controlled, stable burning conditions
- In the studies cited below, emissions from properly made candles were generally below applicable indoor-air quality guidelines under controlled, stable burning conditions
- Wax type can influence some emissions, but wick quality and burning conditions can matter just as much or more
- Long wicks, drafts, unstable flames, and excessive burn times can increase soot and particulate emissions
- Ventilation remains important for every candle type
This does not mean candles produce no emissions. Any open flame creates combustion byproducts. It means the common claim that paraffin candles are inherently toxic is not supported by most of the available peer-reviewed candle-emissions research.
What the Ökometric study found
The Ökometric wax and emissions study, completed at the Bayreuth Institute of Environmental Research in Germany, compared reference candles made from paraffin, soy, stearin, palm wax, and beeswax.
Researchers tested emissions for more than 300 chemicals, including:
- Volatile organic compounds
- Aldehydes
- Polycyclic aromatic hydrocarbons
- Dioxins and furans
- Benzene
- Benzo[a]pyrene
- Particulate matter
The study was supported by candle industry organizations, including the National Candle Association. That funding should be disclosed at the outset when discussing the findings. It does not make the data irrelevant, but it is a reason to consider the study alongside independent research rather than treating one report as the entire evidence base.
In the Ökometric study, researchers found no meaningful difference in burning behavior among the major wax types under the test conditions. Emissions were described as virtually identical in composition and quantity, with levels far below the most restrictive applicable indoor-air standards.
In the Ökometric study, paraffin, soy, stearin, and beeswax showed comparable total volatile organic compound emission rates. The calculated closed-room TVOC levels averaged less than 2% of the applicable indoor-air standard.
In the Ökometric study, no benzene emissions were detected in the reference candle samples. The measured levels of formaldehyde, acetaldehyde, benzo[a]pyrene, and dioxins or furans were also low compared with the relevant reference values.
Controlled chamber studies may not fully reflect real-world use, where wick maintenance, drafts, and burn habits vary.
What newer research adds
A 2021 study published in Environment International examined emissions from 24 scented and unscented candles made with four wax types, including paraffin and soy.
The 2021 Environment International study used an 8 m³ test chamber and measured:
- Carbon monoxide and carbon dioxide
- Nitrogen oxides
- Formaldehyde and other aldehydes
- Benzene and other VOCs
- PM2.5
- Ultrafine particles
- Polycyclic aromatic hydrocarbons
The 2021 Environment International study found that most calculated indoor concentrations were below the relevant guidance and reference values under the study’s modeled residential exposure conditions.
The 2021 Environment International study did identify exceptions in some cases, particularly for nitrogen dioxide, acrolein, and benzo[a]pyrene. Those findings support sensible candle habits rather than an automatic conclusion that paraffin candles should not be used.
The 2021 Environment International study also found that fragrance composition affected emissions. In some combinations, fragrance ingredients contributed more to the VOC profile than the base wax. This is one reason the full candle system matters more than a simple paraffin-versus-soy comparison.
A National Candle Association PDF of the study is also available as a secondary source, and the National Candle Association research summary provides additional background on candle emissions studies and their limitations.
Why some tests produce alarming results
Candle emissions can change significantly when a flame is disturbed or allowed to burn inefficiently.
Examples include:
- An untrimmed or mushroomed wick
- A wick that is too large for the candle
- A candle placed in a draft
- A flickering or unstable flame
- Several candles burning in a small room
- A long burn session without a break
- A candle that is allowed to smolder after extinguishing
These conditions increase incomplete combustion. The result can be more visible soot, fine particles, and other byproducts.
The 2021 Indoor Air study on stressed burning tested pillar candles under controlled fluctuating air velocities. The study found that wax and wick composition influenced soot, PM2.5, and particle-phase PAHs under stressed conditions. It also concluded that preventing stressed burning can reduce exposure.
This is useful evidence, but it should not be confused with ordinary stable burning. A candle burning in a draft with a long wick is not performing under the same conditions as a properly maintained candle in a calm room.
Some alarming online demonstrations also use multiple candles in small, poorly ventilated chambers or measure emissions directly above the flame. These setups can be useful for identifying worst-case behavior. They do not automatically represent normal residential exposure.
Paraffin vs. soy
Paraffin
Paraffin is a refined petroleum-derived wax. It is widely used because it offers:
- Consistent texture
- Reliable fragrance distribution
- Strong scent throw
- Stable color and finish
- Predictable burn behavior when properly wicked
The available emissions research does not show that paraffin is inherently toxic when used in a well-made candle under normal conditions.
Soy
Soy wax is made from soybean oil. It is often selected for its plant-based origin and slower, softer burn characteristics.
Soy is not automatically emission-free. It can still produce soot, VOCs, and particulate matter if the wick is oversized, the flame is disturbed, or the candle is burned incorrectly.
Some comparative tests have found lower soot or particulate emissions from particular soy candles. Other studies have found that differences between wax types are inconsistent and depend on the wick, fragrance, burn rate, and test conditions.
The more accurate comparison is not “paraffin is unsafe and soy is safe.” It is:
A well-made candle with a suitable wick and stable flame is preferable to a poorly made candle, regardless of wax type.
How to burn any candle responsibly
Use these habits with paraffin, soy, or blended candles.
Trim the wick
Trim the wick to approximately ¼ inch, or about 5 to 6 mm, before each burn.
A shorter wick helps control flame height and reduces the chance of soot, smoking, and excessive heat.
Choose a ventilated room
Burn candles in a room with normal air circulation. Avoid sealed spaces where pollutants can accumulate.
Ventilation does not mean placing the candle beside an open window. Drafts can disturb the flame and increase soot.
Avoid fans and vents
Keep candles away from ceiling fans, air-conditioning vents, open windows, and high-traffic areas.
A steady flame generally indicates more stable combustion.
Limit each burn
Follow the product instructions. As a general practice, avoid burning a candle for more than about 3 to 4 hours at a time.
Extinguish the candle and allow the wax to cool before relighting.
Monitor the flame
Extinguish the candle if the flame becomes unusually high, flickers continuously, smokes, or produces visible soot.
Do not leave a burning candle unattended.
Consider household sensitivities
People with asthma, fragrance sensitivity, or respiratory conditions may react to scented products even when average emissions remain below general indoor-air guidelines.
Use shorter burn times, increase ventilation, or avoid fragranced candles if symptoms occur. Seek individual medical advice for personal health concerns.
The Candle Connoisseur Club approach
Candle Connoisseur Club candles are hand-poured in small batches using a paraffin-soy wax blend. The 24 oz Signature Pillar Candles are designed for a room-filling fragrance and a 90+ hour burn time when used according to proper candle-care instructions.
The blend is one part of the product design. Wick selection, fragrance load, pouring quality, and burn guidance also affect the final experience.
For gifting, the Gift Box is listed at $65 and includes a full-size candle, hurricane holder, and electric lighter. Availability may vary.
The practical conclusion
Paraffin is not automatically toxic. Most of the available peer-reviewed candle-emissions research does not support the broad claim that paraffin candles are unsafe alternatives to soy.
The evidence supports a more specific conclusion:
- Based on the evidence reviewed here, well-made paraffin and soy candles can generally be used safely under normal conditions
- Emissions from stable burning are generally below indoor-air guidelines for most measured pollutants
- Some tests show differences between wax types, especially under stressed burning
- Wick quality, flame stability, fragrance composition, ventilation, and burn time strongly influence emissions
- Proper candle care remains important regardless of the wax blend
Choose a candle based on its construction, fragrance, burn instructions, and intended use. Then trim the wick, maintain a steady flame, ventilate the room, and extinguish the candle after a moderate burn session.
Editorial review required: This draft contains health-adjacent claims and must be reviewed by Linda before publication, according to Lanie’s process.