Can You Dye Your Hair While Pregnant?

The minute you learn you're pregnant, even the simplest everyday routines, such as your morning latte, the sushi you're craving or the skin care products you use, suddenly become rife with potential risks.

Your usual salon appointment falls into that category, especially when hair colour comes into play. Should you avoid hair dye when pregnant, or is it just another beauty myth that lingers on?

To help you separate fact from fear, we asked experts to weigh in on what's actually safe to dye during pregnancy, what's been blown out of proportion, and the safer alternatives worth considering.

Why people worry about hair dye during pregnancy

A fresh dye job can feel like an instant confidence boost, but many wonder if it's safe to colour your hair while pregnant, especially in the early weeks. In fact, when we asked in a recent Instagram poll, "Did You Dye Your Hair During Pregnancy," the responses were nearly split: 48 percent said, "Yes, I can't stand having roots," while 52 percent said,  "No, I skipped it."

So why the mixed feelings? According to Dr. Michele Green, MD, a board-certified cosmetic dermatologist in New York City, the main caution comes during the first trimester. "This is because the first 12 weeks of fetal development are essential for the baby’s major organs and systems," she explains.

The concern also centers on certain chemicals found in hair colour, such as ammonia, hydrogen peroxide, paraphenylenediamine (PPD), and resorcinol. "Because dye sits on the scalp, the worry is that chemicals could be absorbed into the bloodstream and potentially reach the fetus," Green adds. The reassuring part: at consumer/salon use levels, studies show only minimal absorption through the skin.

The first-trimester caution (and what evidence actually says)

The “12-week rule” is one of the biggest sources of hair-dye anxiety during pregnancy. The general idea: don’t colour your hair until you’re past the first trimester. But as Green explains, that’s more myth than medical fact.

Supporting this, Dr. Alison M. Key, MD, FACOG, a board-certified OB-GYN, notes there are no major studies or medical guidelines that actually support the rule.

"While some experts recommend waiting until after the first trimester to apply hair colour as an extra precaution, there isn't much research and medical review showing any real risks tied to dyeing hair in early pregnancy," she emphasizes.

Is hair dye safe during pregnancy?

According to medical research, the answer is generally yes, when used as directed. A 2008 Canadian study found that hair dyes and similar products are absorbed through the skin in only minimal amounts—too little to pose a likely risk to the fetus.

While the study suggests that animal studies have linked such chemicals to negative effects, it was only in cases of extremely high doses. Still, when in doubt, Green emphasizes that your OB-GYN is the best person to help you decide what’s safe and what’s better to skip.

How hair dye chemicals interact with your body

Aliyya Childs, MD, an OB-GYN specializing in women’s health, explains that permanent hair dyes contain a mix of ingredients, each with a job in the colouring process:

• Ammonia opens the hair cuticle
• Hydrogen peroxide develops/lightens
• PPD provides the colour (especially in darker shades)
• Some formulas also include resorcinol, conditioners, oils and preservatives

Dr. Aliyya Childs, an OB-GYN specializing in women’s health, explains that permanent hair dyes contain a mix of ingredients, each with a role in the colouring process.

Here’s the reassuring part: Childs says that most of the dye coats the hair shaft, which is made of keratin and doesn’t absorb into the body. "Only a tiny amount may touch the scalp, and even less can pass through the skin. That’s why experts, including the American College of Obstetricians and Gynecologists (ACOG), generally consider hair colouring safe during pregnancy."

The key distinction is between topical vs. systemic exposure. "Applying dye to hair means only minimal contact with skin, while swallowing or inhaling chemicals gives the body a more direct route to absorb larger amounts," Childs says. "Toxicologists also emphasize that risk depends on dose—while high doses of certain chemicals may be harmful in laboratory settings, the very small exposures from normal use of hair dye are not considered dangerous."

Safer hair dye practices during pregnancy

If you decide to apply hair dye during pregnancy, Dr. Maral Malekzadeh, a board-certified OB-GYN, says there are some safety steps to keep in mind. From ensuring good ventilation to choosing ammonia-free dyes, here are her top tips.

Choose safer dye options

If you'd like to keep colouring your hair during pregnancy, Malekzadeh points to temporary, semi-permanent, and vegetable-based dyes as safer choices.

"Unlike harsher formulas with ammonia or peroxide, these dyes do not penetrate the hair shaft as deeply and are less likely to be absorbed through the scalp, meaning less exposure to the bloodstream, especially when used in a small amount," she notes.

Try highlights

Highlights, balayage, or a face-framing money piece are all safe choices, according to Malekzadeh. "Since these methods target the hair instead of the scalp, the dye largely bypasses skin contact—meaning less chemical absorption," she suggests.

Ventilation is important

“Keeping fresh air circulating—whether with a cracked window, a fan, or a salon’s ventilation system—goes a long way in cutting down how much of the fumes you breathe in,” explains Malekzadeh.

She continues, "Salons typically have well-ventilated areas, and stylists add another layer of protection. They’re also trained to apply dye with care, wear gloves, avoid the scalp as much as possible, and even suggest gentler formulas if you’re looking to minimize exposure further."

Perform a patch test

Because pregnancy can make skin extra sensitive, Malekzadeh recommends doing a patch test before committing to a full dye job.

"Even if you’ve used the same formula for years without a problem, your body may react differently now," she adds. "Testing first helps avoid unexpected irritation and ensures an extra layer of safety."

Alternative hair colour options for expectant parents

If you're thinking twice about traditional hair dye, there are plenty of gentler options worth exploring, from henna and glosses to natural lighteners like chamomile and lemon.

While these alternatives may not deliver salon-quality results, they can give you peace of mind knowing they're gentler on your hair and health.

Try plant-based colour

For those wary of chemical dyes, Green suggests opting for natural alternatives from plants.

"Options such as henna, indigo, and chamomile are safe choices," she recommends. "These options are considered safe, but keep in mind—they usually won’t deliver a dramatic colour shift."

Choose the right henna

Pure henna is generally considered safe during pregnancy, but Green cautions against using 'black henna.'

"This version often contains paraphenylenediamine, a chemical found in many hair dyes that helps deepen the color and extend its wear," she suggests. "However, the chemical is not approved for direct application to the skin and may pose risks to your baby."

Lighten up with chamomile or lemon

If you want a more natural approach to brightening your hair, Green suggests reaching for chamomile or lemon juice. “Chamomile helps enhance blonde and golden tones,” she explains, while the citric acid in lemon juice acts as a gentle, plant-powered lightener.

Experiment with gloss and toners

Green also recommends trying at-home glosses and toners, which boost shine and help balance out old dye jobs.

"Unlike permanent hair colour, which penetrates the hair shaft,  requires regular root touch-ups, and can be harsher on the strands, glosses add luminosity with a subtle tint, while toners work to refine colour and neutralize brassiness," she says.

Stick to root touch-up sprays and powders

"Non-permanent, root-touch-up sprays and powders do not absorb into the scalp and are made to coat strands of hair, reducing chemical exposure," Green shares. "Although generally safe, again, it is recommended to consult your board-certified OB-GYN before using any hair dyes on your scalp."

Or simply go au naturel

Of course, you also have the option to skip the dye altogether and embrace your natural shade.

According to Green, this route has its perks: zero chemical exposure, fewer salon visits (a gift when you’re managing a packed schedule), and extra savings from not keeping up with regular touch-ups.

The bottom line

Choosing how to care for hair during pregnancy can feel overwhelming with all the myths and mixed advice, but the bottom line is that, for most people, colouring hair is generally considered safe, with a few sensible precautions.

If, however, you are unsure, Malekzadeh recommends consulting your physician for further guidance. "Everyone’s situation is different (medical history, sensitivities, occupational exposure, frequency of use)," she explains. "Your clinician can help personalize advice, especially if you have allergies or asthma. Using trusted, evidence-based sources helps avoid misinformation."

Experts:

• Michele Green, MD, is a board-certified cosmetic dermatologist based in New York City.
• Alison M. Key, MD, FACOG, is a board-certified OB-GYN affiliated with West Jefferson Medical Center and Tulane Lakeside Hospital in Louisiana.
• Aliyya Childs, MD, is an OB-GYN specializing in women’s health at Houston Methodist Sugar Land Hospital in Sugar Land, Texas.
• Maral Malekzadeh, MD, is a board-certified OB-GYN and Director of Clinical Operations at The Well Westlake, a women’s health and wellness center in Westlake, Ohio.