Do candles lower testosterone? The short answer is that some of them can, and the mechanism is phthalates, not the flame itself.
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Phthalates are chemical compounds added to many fragrance oils to help a scent cling to the air longer. Research has linked certain phthalates to lower testosterone in men, and a candle burning for hours in a closed bedroom is one of the more direct ways to breathe them in. The fix is not giving up candles. It is choosing one made without toxic fragrance, like the ones in MBur's collection of pure beeswax candles, built without a single phthalate in the formula.
Why a scented candle can carry phthalates into your bedroom
Candle makers are rarely required to list what is actually inside the word "fragrance" on a label. That single word can legally cover dozens of chemical ingredients, protected as a trade secret.
Phthalates such as DEP, DBP, and BBP often ride along inside those fragrance blends. Their job is to act as a fixative, holding the scent together so it lasts longer on the shelf and throws further into a room.
The problem is that phthalates are endocrine disrupting chemicals. They can interfere with hormone production in the body, block testosterone synthesis, and act in ways that work against androgens like testosterone. That is the chain: fragrance oil, phthalate fixative, airborne exposure, hormone interference.
What the research actually says about phthalates and testosterone
A study published through the National Institutes of Health looked at phthalate metabolites and testosterone across different age groups. In men over 60, each doubling of certain high molecular weight phthalate byproducts in urine was associated with roughly a 7.7 percent drop in total testosterone. You can read the full NIH analysis here.
Younger men showed a different pattern. Lower molecular weight phthalates, the kind common in fragrance products, showed associations with testosterone in men aged 20 to 39. The relationship is not identical across every age, but the direction is consistent: more phthalate exposure tracks with lower testosterone.
This is population data, not a guarantee about any one person. If you have concerns about your own hormone levels, talk to your doctor. Blood work, not candle shopping, is how you find out where you actually stand.
The National Institute of Environmental Health Sciences has more on how endocrine disruptors work in the body generally, beyond just candles.
The wax matters as much as the fragrance
Phthalates are not the only variable. The wax a candle is made from decides what else is going into the air while it burns.
Paraffin is a petroleum byproduct. Burning it can release volatile organic compounds like toluene and benzene, on top of whatever is in the fragrance oil. Soy wax is a step up, but most soy candles are blended with paraffin and still rely on the same undisclosed fragrance oils. Beeswax is a naturally occurring substance, not something refined from crude oil, and it needs no chemical processing to become a candle.
| Wax type | Wick | Burn behavior | Soot | Fragrance | Dye | Made where |
|---|---|---|---|---|---|---|
| Paraffin | Often cotton with a metal core | Can tunnel, uneven melt | Visible black soot common | Typically undisclosed fragrance oils | Often artificial dye | Varies, mass manufactured |
| Soy (blended) | Cotton wick | Softer melt, can still tunnel | Lower than paraffin, not zero | Often undisclosed fragrance oils | Sometimes dyed | Varies |
| MBur beeswax | Wooden wick, two in the 12 oz size | Even burn, up to 80+ hours in the 12 oz | Minimal, clean burn | Phthalate-free fragrance | No chemical dye | Hand poured in New York City |
The real risk sits in specific ingredients, not candles as a category
It would be easy to swear off candles entirely after reading this, but that throws out a lot of good scent for no reason. The risk comes from four specific things, and you can check for each one.
- Toxic fragrance with phthalates. This is the main driver of the hormone concern above.
- Metal core wicks. Lead wicks are banned in the US, but zinc core wicks are still common and burn differently than cotton or wood.
- Paraffin soot. The black residue on jars and walls is unburned petroleum particulate, not just dirt.
- Artificial dye. Added for shelf appeal, not for how the candle burns or smells.
A candle that avoids all four is not making a health claim. It is simply not adding those specific risk factors to your air.
A checklist for choosing a candle that will not fight your hormones
Picture the candle you actually reach for most nights, the one on your dresser or your desk that you light without thinking twice. That candle should meet a short list of requirements before it earns that spot.
- Wax is named specifically: 100% beeswax, not a vague "wax blend."
- Fragrance is stated as phthalate-free, not just "natural."
- Wick is cotton or wood, never a metal core.
- No chemical dye added for color.
- Burn time is disclosed as a real spec, not a guess.
Our Adi candle is the one a lot of men end up reaching for as a daily, no-fuss scent. It runs citrus forward with lemon, orange, grapefruit, mandarin, tangerine, lime, peach, and agave, and it is made with 100% beeswax, a wooden wick, and phthalate-free fragrance. Nothing in it needs to be hidden behind the word "fragrance."
"Everything from this company is amazing so this candle matching that energy is no surprise. Will definitely be buying again." Eboni Ellis, on the Adi Citrus Pure Beeswax Candle
Simple habits that lower your exposure further
Even with a clean candle, a few habits help keep your air better.
Crack a window or run a fan while you burn, especially in a small bedroom. Trim the wick to about a quarter inch before every light, since a long wick burns hotter and less evenly. Keep any burn session to a few hours at a time rather than letting it run all night, and let the wax fully cool before relighting.
Frequently asked questions
Do scented candles actually lower testosterone levels?
Some conventional scented candles release phthalates, which are endocrine disrupting chemicals that population studies have linked to lower testosterone. Choosing a candle without them, like the ones in our beeswax candle collection, removes that specific risk factor.
What are phthalates and why are they in candles?
Phthalates are chemical plasticizers and solvents often added to fragrance oils as fixatives, helping a scent last longer and throw further into a room. They are not required to be listed individually on a candle label.
Are all candles dangerous for men's hormones?
No. Candles made with 100% beeswax or soy and fragrance that is explicitly phthalate-free, like our Adi candle, do not carry this particular risk.
How can I tell if my candles contain phthalates?
Most labels will not list individual fragrance chemicals, so look for brands that state phthalate-free directly rather than relying on the word "natural" alone. Our full candle lineup states this on every product page.
What other symptoms are linked to endocrine-disrupting chemicals?
Beyond hormone concerns, chronic exposure to low-quality candle emissions has been associated with headaches and respiratory irritation. If you have ongoing symptoms, bring them up with your doctor rather than guessing at the cause.
The bottom line for your bedroom or desk
The candle itself was never the problem. The phthalates hiding inside an undisclosed fragrance oil are, and you can check for them the same way you would check any ingredient label.
For a scent you reach for every day, pick the 12 oz Adi candle for $65. It runs on two wooden wicks for 80+ hours, which matters if you are lighting it most nights, and it carries no phthalates in its fragrance because beeswax and clean fragrance oils are the only ingredients in the jar. If you want something brighter for a morning routine instead, the Zesty candle leans into ocean breeze and mandarin for a cleaner wake-up scent. Customers rate MBur's candles highly for how fully they fill a room without the headaches some report from conventional brands. There is no reason to wait on this one since the phthalates in a conventional candle are being inhaled every time you light it tonight.
Shop MBur's phthalate-free beeswax candles now
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