African black soap and shea butter: what they do, what the evidence says, and how to use them safely

Key takeaways

• African black soap is a true alkaline soap, around pH 9 to 10, while healthy skin sits near pH 4.7, so it cleans well but dries and irritates easily.
• The research is thin: one user survey that measured satisfaction, not skin, and laboratory tests showing it kills bacteria in a dish, as most soaps do.
• Irritation triggers dark marks in brown and Black skin, so over-washing with black soap to fade spots can backfire; sunscreen and gentle actives do that job.
• Shea butter is a good occlusive moisturiser for dry body skin and eczema-prone skin between flares, with limited trial evidence and no sunscreen effect.
• Use black soap as a body wash or an occasional evening face wash, follow it with moisturiser every time, and skip it on eczema-prone, dry or sensitive skin.

African black soap is a strong traditional soap; shea butter is a rich plant fat. This guide explains what each one is, what the small amount of research says, why black soap can leave skin tight and irritated, and how to use both gently, especially on brown or Black skin that is prone to dark marks.

What African black soap is, and why it behaves the way it does

A real soap made the old way

African black soap comes from West Africa (ose dudu in Nigeria, alata samina in Ghana). Plantain skins, cocoa pods and other plant waste are burned, the ash is soaked to draw out its alkali, and that lye is cooked with palm oil, palm kernel oil or shea butter into a soft brown-to-black mass^{1, 2}. Traditional bars are soft, crumbly and unscented; a hard, jet-black, perfumed bar is probably not the traditional product.

Soap, pH and your skin barrier

All true soaps are alkaline, typically pH 9 to 10⁵. Healthy skin is acidic: a study of 330 adults put natural surface pH at about 4.7, and skin kept below pH 5 had a stronger barrier, held more water and flaked less⁴. That acid film also keeps friendly resident bacteria attached; an alkaline surface loosens their grip⁴. Alkaline soap pushes the surface pH up for hours⁴ and strips lipids from the outer layer, which is why soap so often leaves skin tight, dry or itchy⁵. The chemistry that makes black soap clean so well is what makes it drying and irritating when overused, left on, or used on dry, eczema-prone or sensitive skin. Gentle non-soap cleansers are made at a neutral or slightly acidic pH for this reason⁵. In brown and Black skin, irritation has a second cost: it is a main trigger of post-inflammatory hyperpigmentation, the flat dark marks that outlast a spot or rash⁶.

What the research on black soap actually shows

Very little: one user survey, one narrative review and a few laboratory antibacterial tests. There are no controlled trials for any skin condition.

The user survey

Evidence: limited. One questionnaire survey of 100 users measured satisfaction, not skin outcomes.

A 2017 New York survey of 100 black soap users found that 70% used it for general skin care, 23% for acne, 20% for dark spots and 7% for eczema, and 30% used it more than once a day¹. Ninety-one percent were satisfied, but they were rating a product they had already paid for, nobody examined their skin, and adverse effects were not assessed¹. Only seven people used it for eczema, and all seven said they were satisfied (two very, five somewhat). Even so, the authors wondered whether so few using it for eczema meant it works less well there, and suggested, without testing it, that black soap's possible drying effect could be the reason¹.

Antibacterial activity

Evidence: lab-only. Black soap kills bacteria in a dish, as almost any soap does; nobody has tested whether that changes acne or odour.

Black soap extracts stop the growth of Staphylococcus aureus and E. coli on laboratory plates, in one Nigerian comparison more strongly than medicated soaps³, and a 2021 review summarised the field as activity against staphylococci and some streptococci². But acne bacteria live inside blocked pores, where a rinse-off wash barely reaches.

What people use it for

• Acne and oily skin. A thorough wash removes surface oil for a few hours. That is cleaning, not treatment, and over-washing backfires: a stripped barrier gets oilier and more inflamed. The ingredients with real evidence are in natural acne care and oily skin and clogged pores.
• Body odour and general cleansing. Odour comes from bacteria acting on sweat, and a soap that cleans well deals with it; the body is where its strength is an advantage.
• Dark spots. It is marketed as "scar-fading" on anecdote alone²; there is no evidence it lightens pigment. Post-inflammatory hyperpigmentation is more frequent and severe in darker skin, is triggered by inflammation or injury, including irritation from harsh products, and deepens with sun exposure⁶, so heavy use tends to keep a mark going. Daily broad-spectrum SPF 30 and gentle actives such as niacinamide, azelaic acid or vitamin C are what help⁶; see dark spots and hyperpigmentation.

How to use black soap safely

• Lather a small piece in your hands and apply the foam. Raw bars crumble and the grit scratches, so never rub the bar on your face.
• Twenty to thirty seconds, then rinse well. It is a wash, not a mask.
• On the face, once a day at most, in the evening; many people do better with two or three evenings a week.
• Avoid the eyes, and moisturise within minutes while skin is damp (shea on the body, something lighter on the face).
• Store it dry; soft bars turn to mush.
• Patch test on the inner arm first, and stop if skin feels tight or stings.
• Skip it on eczema-prone, very dry, sensitive or broken skin. The NHS advises people with eczema to avoid soap altogether and wash with an emollient instead⁷.

Shea butter: what it is and what it does

Shea butter is pressed from the nuts of Vitellaria paradoxa, a savannah tree growing from Senegal to Uganda, where women's cooperatives do much of the processing. It is mostly stearic and oleic acids plus a large "unsaponifiable" fraction of triterpenes, vitamin E, sterols and phenols, which shows anti-inflammatory activity in the laboratory⁸. Raw butter is yellowish and nutty; refined is white, odourless and has lost some of those compounds (see our shea butter entry).

Evidence: limited. Strong traditional use and a plausible occlusive mechanism; one small uncontrolled eczema study; anti-inflammatory claims rest on laboratory work.

Shea does what any good occlusive fat does: it slows water loss and softens rough, cracked skin. In the main study, 34 children with eczema used a shea-extract cream and cleanser for four weeks; about three-quarters rated it good or very good, itch fell slightly in that group, and results matched a ceramide moisturiser tested earlier, with no placebo comparison⁹. A 2017 review rated its barrier-repair effect "possible" rather than established; the anti-inflammatory results come from cells, not people⁸. Shea is not a sunscreen and has no tested SPF, and it is a heavy fat that can clog pores, so if you break out easily keep it to the body and very dry areas.

How to use it

• Press a little onto damp skin after washing, as the "seal" over a humectant such as glycerine or aloe gel, especially on lips, hands, heels and elbows.
• Stretch marks: we found no evidence that shea, or any butter, prevents or removes them, though moisturising may ease the itch.

Cautions

• The tree-nut and latex allergy concern is theoretical; patch test anyway.
• Raw butter goes rancid: a sharp, sour smell means replace it. Keep it lidded, clean and cool.
• It does not treat infected or weeping eczema; see eczema and dry, itchy skin.

How they fit together in a routine

Black soap is the occasional or body cleanser, shea the moisturiser, and the basics from our simple natural skin care routine go around them.

1. Morning: water or a gentle cleanser, a light moisturiser, then broad-spectrum SPF 30 or higher every day (tinted mineral options avoid white cast; see sun protection for every skin tone).
2. Evening: black soap lather for twenty seconds, rinsed well, at most once a day if your skin is oily and tolerates it; otherwise a gentle cleanser. Then one active if needed, and a light non-comedogenic moisturiser.
3. In the shower: black soap on the body, shea on damp skin straight after; one change at a time.

A few other traditional African ingredients

Marula oil, baobab oil and aloe vera

Evidence: limited. One small cosmetic study of marula oil; no trials of marula or baobab in any skin condition; aloe is a soothing companion, not a treatment.

Marula oil is about 70% oleic acid; in 20 women it was non-irritating, hydrated dry skin and reduced water loss¹⁰. Baobab seed oil is lighter and richer in linoleic acid. Both are pleasant emollients; neither treats anything. Aloe gel makes a good humectant layer under shea; pick one that is mostly aloe, and see our aloe vera entry.

Moringa seed oil

Evidence: lab-only. We could not verify any trial in a skin condition.

A light, oleic-rich oil; claims about calming inflammation rest on laboratory work. Low risk as a moisturiser, untested as a treatment.

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What to avoid

• The lightening myth. Black soap does not bleach or lighten skin. Unregulated lightening creams are a separate, serious risk; see melanin-rich skin care.
• Mixing it with lemon juice or other acids. That makes an unpredictable product, not a gentler one, and lemon reacts with sunlight to cause burns and dark patches; see DIY remedies to avoid.
• Leaving it on as a mask, rubbing the raw bar on your face, or scrubbing dark marks with it.
• Dyed, perfumed "black soap" bars; fragrance is a common cause of reactions.
• Any black soap or shea product that promises to lighten, fade marks in days or clear a skin condition; those promises are a warning sign.

Realistic expectations, and when to get professional help

Expect black soap to clean and shea to keep skin soft; neither changes acne, eczema or dark marks on its own. Give any routine 8 to 12 weeks: comfort comes first, fewer new spots later, and marks fade over months, mostly thanks to sunscreen. If skin becomes tighter, flakier or darker in patches, the routine is working against you.

See when to see a dermatologist for what to expect and how to find affordable care, and our free weekly skin care tips for gentle reminders.

Common questions

Is African black soap good for acne?

Nobody has tested it in a trial. It cleans thoroughly, which can make oily skin feel less greasy for a few hours, but there is no evidence it reduces spots, and used more than once a day it tends to dry and irritate skin, which makes acne and dark marks worse. Ingredients with real acne evidence, such as diluted tea tree oil, niacinamide and low-strength salicylic acid, are a better bet.

Does black soap fade dark spots or lighten skin?

No. There is no evidence that it lightens pigment, and it should never be sold as a lightener. Because it is alkaline and slightly abrasive, scrubbing marks with it keeps them irritated, and irritation is one of the main triggers of post-inflammatory hyperpigmentation in brown and Black skin. Daily sunscreen plus gentle actives used for months is what helps marks fade.

Can I use shea butter on my face?

Some people can, many cannot. Shea is a heavy, occlusive fat with no good trial on whether it clogs pores, so if you break out easily keep it to the body, lips, hands and feet and use a lighter non-comedogenic moisturiser on the face. If your face is very dry and not acne-prone, a thin layer pressed onto damp skin at night is reasonable.

Can I use black soap if I have eczema?

It is best avoided. People with eczema are advised to avoid soap altogether and wash with an emollient instead, because alkaline soap strips the lipids that an eczema-prone barrier is already short of. Shea butter, on the other hand, is a reasonable moisturiser for eczema-prone body skin between flares.

Sources

1. Lin A, Nabatian A, Halverstam CP (2017). Discovering black soap: a survey on the attitudes and practices of black soap users. Journal of Clinical and Aesthetic Dermatology. pmc.ncbi.nlm.nih.gov/articles/PMC5605219
2. Ogunbiyi A, Enechukwu NA (2021). African black soap: physiochemical, phytochemical properties, and uses. Dermatologic Therapy. pubmed.ncbi.nlm.nih.gov/33571401
3. Olajuyigbe OO, Adeoye-Isijola MO, Adedayo O (2017). A comparison of the antibacterial activity of some African black soaps and medicated soaps commonly used for the treatment of bacteria-infected wound. Journal of Medicinal Plants for Economic Development. jomped.org/index.php/jomped/article/view/20
4. Lambers H, Piessens S, Bloem A, Pronk H, Finkel P (2006). Natural skin surface pH is on average below 5, which is beneficial for its resident flora. International Journal of Cosmetic Science. pubmed.ncbi.nlm.nih.gov/18489300
5. Mukhopadhyay P (2011). Cleansers and their role in various dermatological disorders. Indian Journal of Dermatology. pmc.ncbi.nlm.nih.gov/articles/PMC3088928
6. Davis EC, Callender VD (2010). Postinflammatory hyperpigmentation: a review of the epidemiology, clinical features, and treatment options in skin of color. Journal of Clinical and Aesthetic Dermatology. pmc.ncbi.nlm.nih.gov/articles/PMC2921758
7. NHS — Atopic eczema: symptoms, causes, treatment and self-care www.nhs.uk/conditions/atopic-eczema
8. Lin TK, Zhong L, Santiago JL (2017). Anti-inflammatory and skin barrier repair effects of topical application of some plant oils. International Journal of Molecular Sciences. pmc.ncbi.nlm.nih.gov/articles/PMC5796020
9. Hon KL et al. (2015). Patient acceptability, efficacy, and skin biophysiology of a cream and cleanser containing lipid complex with shea butter extract versus a ceramide product for eczema. Hong Kong Medical Journal. pubmed.ncbi.nlm.nih.gov/26314567
10. Komane B, Vermaak I, Summers B, Viljoen A (2015). Safety and efficacy of Sclerocarya birrea (A.Rich.) Hochst (Marula) oil: a clinical perspective. Journal of Ethnopharmacology. pubmed.ncbi.nlm.nih.gov/26528587