Can Calendula Oil Regrow Hair? The Baldness Claim Examined
No, and nothing we have found supports saying our calendula oil will regrow hair. We searched PubMed for calendula alongside hair loss, alopecia, scalp and dandruff and found no relevant human study. The claim keeps circulating anyway, so this page looks at why it persists, what the evidence for plant oils on hair loss looks like when it does exist, and why a seller who made the claim would be crossing a legal line.
Calendula Oil
Our own small-batch calendula oil, in sizes from 0.5 oz to bulk.
From $13.99
Shop Calendula Oil →The verdict, and what the search did and did not show
An empty search is not proof of a negative: trials in regional journals or registries could exist that we could not exhaustively search. What it does establish is that we have no calendula hair-regrowth trial to cite, and we would not cite a claim we cannot source. The EU herbal committee's calendula monograph lists traditional uses for minor skin inflammation, minor wounds, and the mouth and throat, based on long-standing use (EMA/HMPC, 2018). Hair is not among them. So even the regulatory record, which is generous to traditional herbs, does not extend to this claim.
Why a seller cannot say it
In the United States, whether a product is a cosmetic or a drug depends on its intended use. FDA's statutory summary describes cosmetics as articles applied to cleanse, beautify, promote attractiveness or alter appearance, and drugs as articles intended to affect the structure or any function of the body or to address disease. Making hair grow back is an effect on the body's function. FDA's page on aromatherapy adds that the fact that an ingredient comes from a plant does not keep a product from being regulated as a drug. The agency has acted on calendula specifically: a 2017 warning letter to a calendula soap maker concluded that website claims about eczema, psoriasis and acne made the products unapproved new drugs. That is one company's letter, not a rule about calendula, but it shows how claim wording is read.
The Federal Trade Commission's side of this is advertising. Its health-products guidance expects benefit claims to rest on competent and reliable scientific evidence, generally randomized controlled human trials. A hair-regrowth line for calendula oil would have no such trial to point to. As a checklist for any hair-oil ad: look for a named human trial, check whether it tested that exact product or a different plant, and check whether it had a placebo arm.
That is why we describe our oil as a plain infused oil and why this article makes no regrowth claim. It is also a quick test for any product: if a seller of a cosmetic oil promises regrowth, the promise itself is a red flag.
What hair loss usually is, and what is approved for it
Androgenetic alopecia, the pattern thinning that affects scalp hair over years, is described in a 2025 review as the most common cause of hair loss, with topical minoxidil and oral finasteride the approved medications (Gupta et al., 2025). Those are prescription or drug-regulated products with side effects of their own, which is the reason people look for alternatives. But hair loss is not one condition. Sudden shedding, patchy loss, scalp scaling or soreness, and loss after illness, pregnancy or a new medication are different problems with different causes. A physician or dermatologist is the person who can tell them apart, and we would not want an oil to be the thing that delays that visit.
The best-case evidence for a plant oil, and how little it stretches
The same review looked at investigator-blinded controlled trials of non-prescription products and found 13 studies of agents including rosemary oil, pumpkin seed oil, caffeine and saw palmetto. It reported improvements in one or more hair measures for some, but limited evidence and a need for higher-quality trials. Calendula was not among them.
The most-discussed plant-oil trial is a 2015 Iranian comparison of rosemary oil with 2% minoxidil in 100 people with androgenetic alopecia over six months. Hair counts were not significantly different at three months in either group, rose significantly in both by six months, and did not differ between groups (Panahi et al., 2015). Scalp itching was significantly higher than baseline in both groups. Two things are worth noting. There was no placebo arm, so the result shows rosemary oil comparable to a modest minoxidil strength in that design, not an effect over doing nothing. And it concerns rosemary oil, a different plant and product from an infused calendula oil, so it is no evidence for ours.
Why the calendula claim persists
Reasoning, not a finding: calendula has a long record as a skin herb, and "good for skin" slides easily into "good for scalp," then into "good for hair growth." Each step feels plausible and none has a study behind it. Calendula also appears in many hair and scalp products as one ingredient among several, so any change a user notices cannot be credited to it. None of the laboratory studies in our library on calendula's skin effects (cell and animal work on wound closure and inflammation) did not measure hair follicles.
What an oil can reasonably be used for on the scalp
If you want an oil as a pre-wash scalp or hair treatment for how it feels, that is a cosmetic use, and the usual cautions apply. Calendula is in the Asteraceae family, and the monograph lists hypersensitivity to that family as a contraindication; skin sensitization has been reported, with frequency unknown. Patch test first (our how-to), and stop if the scalp itches, burns or flakes more. Be wary of stacking an oil with a minoxidil product without asking the prescriber, since we have no data on how they interact. For ways to use the oil on hair as a conditioning step, with no regrowth expectation, see the hair mask article; our broader view of the topic sits in the scalp and hair article.
What we can document is process. We buy dried flowers from family farms, make the oil in-house, and keep a batch record: each bottle is dated and lot-numbered, and the batch paperwork, including the carrier oil, is available if you email the lot number to [email protected]. That tells you what is in the bottle. It does not make the bottle a hair product.
When to see someone about hair loss
See a dermatologist or your primary care clinician if hair is coming out in patches, if shedding is sudden or heavy, if your scalp is sore, scaly or red, or if thinning is running in your family and bothering you. What to do about it is a decision for them to make with you.
Calendula oil is a pleasant oil to use on skin and hair, and we are glad to make it. We will not tell you it grows hair, because the evidence we could find does not say that, and the law treats that sentence as a drug claim.
Calendula Oil
Nature's Golden Botanical, bottled: small-batch calendula oil in sizes from 0.5 oz to bulk.
From $13.99
Shop Calendula Oil →Sources & Further Reading
- European Medicines Agency, HMPC, 2018. EU herbal monograph on Calendula officinalis L., flos (EMA/HMPC/437450/2017). ema.europa.eu
- U.S. Food and Drug Administration. Cosmetics & U.S. Law. fda.gov
- U.S. Food and Drug Administration. Aromatherapy. fda.gov
- U.S. Food and Drug Administration, 2017. Warning letter to Be Natural Organics (MARCS-CMS 523615). fda.gov
- Federal Trade Commission. Health Products Compliance Guidance. ftc.gov
- Gupta AK et al., 2025. Do non-prescription products help in managing androgenic alopecia? Skin Appendage Disord. PMID 40475103
- Panahi Y et al., 2015. Rosemary oil vs minoxidil 2% for the treatment of androgenetic alopecia: a randomized comparative trial. Skinmed. PMID 25842469