Is Rosemary Oil Safe During Pregnancy for Hair?

Mar 19
6 min read

Rosemary oil is taking over TikTok. From before and after videos to scalp massages to homemade hair growth serums, it’s something a lot of people grab without hesitation. But if you’re pregnant and wondering “is rosemary oil safe during pregnancy for hair?” deserves a much deeper answer than what you’ll find in the comments of a TikTok.

Here’s what the research really has to say on the topic, what doctors recommend, and what to try instead if your hair is thinning while pregnant.

What Is Rosemary Oil and Why Do People Use It on Hair?

Rosemary oil is derived from the leaves of the Rosmarinus officinalis plant. Its active ingredients include camphor, 1,8 cineole (aka eucalyptol), alpha-pinene and others. These elements give rosemary oil its signature scent and properties, both good and bad.

Hair grows on mice too, and they react to rosemary oil just like we do. A 2015 study in SkinMED journal showed promise in rosemary oil during pregnancy when compared to minoxidil (2%) as a treatment for androgenetic alopecia. Both test groups saw increases in hair count with no statistical difference between them after six months. Another small study from 2023 applied hair lotion with 1% rosemary essential oil to mice and found it promoted hair growth more than minoxidil did.

For what it's worth, the majority of studies have been done on mice. Not only that, but the EPA doesn't regulate essential oils so there are some validity issues when it comes to quality and safety. We just don't know enough about how rosemary oil affects hair growth in humans yet.

Why Pregnancy Changes Everything

When you’re pregnant, don’t try things out on yourself that lack safety information. You’re more porous than usual, your hormones are all over the place, and whatever you put on your skin can make its way to your baby. Just because something is relatively harmless for a normal adult doesn’t mean it’s safe for a developing foetus.

Here are some details about rosemary oil.

Camphor Crosses the Placenta

Here are some details about rosemary oil.

Rosemary Oil Acts as a Uterine Stimulant

Rosemary oil is known to be a uterine stimulant. Uterine stimulants will stimulate contractions of the uterus. You don't want this to happen during your first two trimesters. Uterus stimulation during this time can cause miscarriage.

It is thought that rosemary oil contains properties that can stimulate both the uterus and menstrual flow. This is why some individuals choose not to use it at all during pregnancy, as it may cause contractions and premature birth.

It May Deplete Amniotic Fluid

Rosemary oil is both diuretic and emmenagogic. This means that it will induce menstruation, and rob you of your precious amniotic fluid that nourishes and allows your baby to grow. Amniotic fluid doesn't grow secondarily. It protects your baby from trauma, helps his lungs develop, and keeps him warm. Take anything that could potentially decrease it with a grain of salt.

What Does the Expert Consensus Say About Rosemary Oil and Pregnancy?

Short answer: most healthcare providers and aromatherapy organizations recommend avoiding it. Rosemary oil is on lists of essential oils to avoid in pregnancy right along with camphor, clary sage, peppermint, and thyme. Experts always warn that each woman's pregnancy and risk factors are different, and your doctor should always be your first resource for these questions. Because there is some risk to the baby, most healthcare providers, clinical aromatherapists, and obstetric experts agree that rosemary oil should be avoided during pregnancy. You aren't likely hurting your baby by avoiding it.

Robert Tisserand, aromatherapy safety expert, states there is little scientific evidence that uterotonic oils actually cause miscarriage in early pregnancy if used in the small amounts typical of aromatherapy. So the possibility of miscarriage from aromatherapy use is not a known danger. But unknown doesn't equal none, and we don't choose to expose pregnant bellies to something that "probably won't hurt" just because the risk isn't dramatic, especially in the first trimester.

Rosemary Oil for Hair During Pregnancy: The Specific Risk Scenario

When people ask me if rosemary oil is safe during pregnancy for hair most often they are asking if they can apply it topically to their scalp as either a diluted serum application or as part of a shampooing or conditioning hair treatment. Let me explain why this particular situation should matter to you.

Rosemary oil applied to your skin will have internal effects because your skin is semi-permeable. That is how topical application can internally affect you without ingestion.

Rosemary oil should NOT be used in shampoo while pregnant because we have no reliable information that rosemary oil used topically is safe during pregnancy. It’s not only about potential scalp absorption of active ingredients. Think about what happens when you rinse the oil out and it flows all over your body…

Rosemary oil should NOT be used topically while pregnant. If you choose to diffuse or inhale rosemary oil, do not during your first trimester.

Pregnancy Hair Loss: What Is Actually Going On

If you are searching for rosemary oil solutions during pregnancy, there is a good chance you have noticed your hair changing. Here is why.

During pregnancy, elevated oestrogen levels typically keep hair in the growth phase for longer, which often means thicker hair during the second and third trimesters. The shedding usually comes postpartum, when hormones readjust rapidly. Some women do experience hair thinning during pregnancy itself, usually linked to nutritional deficiencies (particularly iron or folate), thyroid changes, or the physical stress on the body.

The good news is that this hair loss is almost always temporary. Addressing the underlying cause, whether that is anaemia, nutritional gaps, or stress, is far more effective than scalp treatments during this period.

If you have concerns about hair changes during your pregnancy, speaking to a specialist is the right move. The team at myGynaePlus offers comprehensive obstetric care and can help identify whether a physical cause is behind your hair changes, rather than leaving you guessing.

Safer Alternatives for Hair During Pregnancy

You do not need to sit on your hands for nine months. There are gentler, better-evidenced approaches to supporting hair health while pregnant.

Nutrition first: Iron deficiency is one of the most common causes of hair thinning in pregnant women. Talk to your midwife about your iron levels, and make sure your prenatal supplement includes adequate folate and biotin.
Gentle scalp massage: Finger massage without any essential oil increases blood flow to the scalp and is completely safe. It takes five minutes and costs nothing.
Mild, fragrance-free shampoos: Many commercial shampoos contain synthetic fragrances, sulphates, and preservatives that can irritate a more sensitive scalp during pregnancy. Switching to a gentle, unfragranced formula is a low-risk way to reduce scalp stress.
Carrier oils without active compounds: Oils like coconut oil, sweet almond oil, or argan oil can be used for scalp conditioning without the pharmacological concerns associated with rosemary essential oil.
After pregnancy: Once you are no longer pregnant or breastfeeding, rosemary oil can be reconsidered as a hair growth aid. If postpartum hair loss is your concern, that is actually when the evidence for rosemary oil becomes more relevant and its use becomes considerably safer.

When to Seek Professional Advice

Don’t treat yourself if you’re noticing clumps of hair falling out, have tender scalps or your thinning hair is coupled with tiredness or sensitivity to the cold. These could be symptoms of thyroid issues or anaemia, which are both treatable but require monitoring if you’re pregnant.

Doctors and specialists at myGynaePlus provide you with antenatal care led by specialists at our clinic in West London, including onward referrals if there’s something else going on other than pregnancy hair.

FAQs

Can I use rosemary oil shampoo during pregnancy?

Most healthcare providers advise against it. Commercial shampoos containing rosemary oil are not well-studied in pregnancy, and the lack of safety data means the precautionary approach is to avoid them. Opt for fragrance-free, gentle shampoos instead and speak to your midwife if you're unsure.

Is diffusing rosemary oil safe in the first trimester?

No. Inhaling or diffusing rosemary oil is generally not recommended during the first trimester, which is when the foetus is most vulnerable. After the first trimester, some practitioners allow brief, well-ventilated aromatherapy, but you should confirm this with your obstetrician or midwife before doing so.

I accidentally used rosemary oil on my scalp while pregnant. Should I be worried?

A single accidental exposure to a small, diluted amount is unlikely to cause harm. There are no documented clinical cases of miscarriage directly linked to topical rosemary oil in humans. That said, speak to your midwife or doctor to put your mind at ease, especially if you are in the first trimester.

Will my hair grow back after pregnancy?

In most cases, yes. Postpartum hair shedding, known as telogen effluvium, typically resolves within six to twelve months after giving birth. It is driven by hormonal shifts and is not a sign of permanent hair loss. Nutrition, rest, and gentle hair care support recovery.

What is the best way to support hair health during pregnancy?

Focus on nutrition over topical treatments. Make sure you are getting adequate iron, folate, and protein through your diet and prenatal supplements. Gentle scalp massage, fragrance-free products, and avoiding tight hairstyles that pull on follicles are all practical, pregnancy-safe approaches. Discuss any significant hair loss with your healthcare provider.