Divi Scalp Serum contains several ingredients that raise concern during pregnancy, including rosemary oil, copper peptides, and essential oils that dermatologists generally recommend avoiding or limiting while expecting. The serum has not been specifically tested for pregnancy safety, and the brand does not make pregnancy-safe claims on its product page.
What’s in Divi Scalp Serum
The full ingredient list includes water, glycerin, vitamin C, caffeine, tea tree oil, green tea extract, rosemary leaf extract, peppermint oil, eucalyptus oil, two peptide compounds (acetyl tetrapeptide-3 and copper tripeptide-1), biotin, hyaluronic acid, menthol, and a range of amino acids like arginine, glycine, and proline. It’s free of sulfates, parabens, phthalates, minoxidil, silicones, and artificial fragrance.
That “free from” list is reassuring at first glance, and many of these ingredients are harmless on their own. But a few specific components in the formula have known or suspected issues during pregnancy.
Rosemary Oil: The Biggest Red Flag
Rosemary oil is one of Divi’s key active ingredients for stimulating the scalp, but it’s also the ingredient most clearly flagged as problematic. WebMD notes that rosemary is linked to heavier menstrual flow and potential miscarriage, and advises pregnant and breastfeeding women against using it. The American Academy of Dermatology groups rosemary oil among the essential oils that should be discussed with a dermatologist and used only on a limited basis during pregnancy, if at all.
Copper Peptides and Pregnancy
Copper tripeptide-1 is one of the star ingredients in Divi’s formula. It supports scalp health and is widely used in anti-aging and hair growth products. However, skincare professionals consistently list pregnancy as a reason to avoid copper peptide treatments. There’s no robust clinical data confirming harm, but there’s also no data confirming safety. That lack of evidence is exactly why most dermatologists default to “skip it until after pregnancy.”
Essential Oils Deserve Caution
Beyond rosemary, Divi contains peppermint oil, eucalyptus oil, tea tree oil, and menthol. The Mayo Clinic Health System advises pregnant people to avoid placing essential oils directly on the skin, noting they can cause allergic reactions, irritation, or other side effects. When essential oils are recommended during pregnancy, it’s typically through inhalation with just one to three drops on a tissue, not through direct skin application like a scalp serum.
Peppermint oil is sometimes considered acceptable during pregnancy for aromatherapy purposes, but applying it to the scalp is a different route of exposure. The scalp is highly vascular, meaning it has a rich blood supply that can absorb ingredients more readily than skin on your arm or leg.
How Much Actually Gets Absorbed
One common reassurance is that topical products applied to the scalp don’t deliver much of their ingredients into the bloodstream. A clinical guidance document from Mothersafe, an Australian pregnancy advisory service, notes that when skin absorption is minimal, “the exposure to the unborn baby is generally insignificant.” Hair dyes and similar treatments are considered low-risk for this reason.
But there’s a difference between a hair dye that sits on the hair shaft and a serum designed to penetrate the scalp. Divi is formulated to be absorbed into the skin of the scalp, not just coat the hair. Ingredients like caffeine and peptides are included specifically because they can reach the follicle. That’s what makes them effective for hair growth, but it also means the “minimal absorption” argument doesn’t apply as neatly here.
What Divi Says About Postpartum Use
Divi markets its serum specifically to postpartum mothers dealing with hair shedding, which affects up to 50% of new moms. The brand highlights that the serum is “formulated without anything you’d think twice about” and reports that 90% of users in a small 31-person study noticed improved fullness over 12 weeks. Notably, Divi promotes the product for postpartum use but does not make claims about safety during pregnancy itself. The brand’s postpartum page also doesn’t address breastfeeding safety directly.
That distinction matters. Postpartum and pregnant are two very different situations in terms of ingredient risk. A product marketed for after delivery is not the same as one cleared for use during pregnancy.
Safer Alternatives While Pregnant
If you’re dealing with thinning hair during pregnancy, there are options with cleaner safety profiles. Biotin supplements (with your provider’s approval), gentle scalp massage, and basic hydrating ingredients like glycerin and hyaluronic acid are all considered low-risk. These last two ingredients are in Divi’s formula, but they’re also available in simpler products without the essential oils and peptides.
The American Academy of Dermatology recommends checking every ingredient on a product label during pregnancy and discussing anything uncertain with your dermatologist or OB. For a serum like Divi that combines multiple ingredients in a “limit or avoid” category, the simplest approach is to set it aside until after pregnancy and, if you’re breastfeeding, to ask your provider before resuming.
The Bottom Line on Timing
Pregnancy-related hair changes are mostly driven by hormonal shifts, and many women experience thicker hair during pregnancy followed by shedding after delivery. If your goal is treating postpartum hair loss, waiting until after delivery to start Divi aligns with how the brand itself positions the product. If you’re pregnant now and worried about thinning, a product with fewer flagged ingredients is a more cautious choice. The rosemary oil, copper peptides, and essential oil blend in Divi’s formula each carry enough uncertainty that most dermatologists would recommend waiting.