Murumuru and tucuma butter: the lauric palm butters with a hard snap

Both melt at 30 to 35 C with 40 to 48 percent lauric acid. Hardness, the sharp melt on skin, use at 5 to 25 percent and the graininess they can bring.

Murumuru and tucuma are kernel fats from two Amazonian palms, and for formulation purposes they are close enough to be treated as one material with two prices. Both are hard at room temperature, both are almost entirely gone by 35 C, and that combination of a firm block and a near-complete collapse at skin temperature is the whole reason to buy either. This page covers the fatty acid profiles, the usage windows, how much wax they let you drop, and the two ways they can still go wrong.

• INCI: Astrocaryum murumuru seed butter
• Melt 30-35 C
• Lauric 40-48%
• Iodine value 10-20

Two palms, one fat profile

Murumuru butter is pressed from the kernel inside the fruit of Astrocaryum murumuru, a spiny palm of the Amazon floodplain. Tucuma butter comes from the kernels of Astrocaryum vulgare or Astrocaryum aculeatum, close relatives from the same genus. INCI lists them as Astrocaryum Murumuru Seed Butter and Astrocaryum Tucuma Seed Butter, with Astrocaryum Vulgare Kernel Butter appearing on some certificates for the second.

One trap before anything else. The fruit of the tucuma palm has an orange, carotenoid-rich pulp, and the oil pressed from that pulp is a completely different material: liquid, oleic-dominated, deeply orange and prone to staining. It is often sold simply as tucuma oil. If a supplier's product is orange and pourable, it is pulp oil, not the kernel butter described here, and it will do none of the things below.

The interesting comparison in that table is not with cocoa butter, it is with coconut. Both Amazonian butters are lauric fats of the same family as coconut and palm kernel oil, yet they set five to ten degrees higher. The reason is the myristic column. Trimyristin melts around 57 C against roughly 46 C for trilaurin, so shifting a third of the fat from C12 to C14 lifts the whole profile. That single difference is why coconut oil is a soft paste that contributes almost no structure above 26 C, while murumuru is a block you have to chip.

What a 30 to 35 C melt actually does on skin

Melt range on its own undersells these butters. What matters is the shape of the curve. Both have a high solid fat content at 20 C, somewhere around 70 to 80 percent, and both fall to effectively nothing by 35 C, so almost all of the transition happens across a five degree window that skin sits at the top of. Shea, by contrast, keeps a few percent solid well past 40 C, which is why it feels cushioned and slightly waxy long after it has softened. The measurement behind all of this is covered in solid fat content.

In use that reads as a clean break. A lip balm at 12 percent murumuru comes out of a pocket firm, resists for a moment, then releases in a thin glossy layer with no waxy residue and no dragging. It is the closest a plant fat gets to the sensory signature of a well-made lipstick. The same property makes it useful in a cleansing balm, where you want the product to hold its shape in the jar and go liquid the instant it meets a warm palm.

The cost of that sharpness is persistence. A fat that is fully liquid at 35 C leaves no solid phase on the skin, so it contributes far less to slowing water loss than a butter that stays partly crystalline. Murumuru is a texture and glide ingredient, not an occlusive backbone, and if a product's job is to hold moisture in overnight it needs something with more staying power alongside it. The hierarchy is set out in occlusive, emollient and humectant, and a worked example that uses murumuru for feel and something else for occlusion is in the overnight lip mask.

Hardness without wax, and how much wax it buys back

Because they are hard at room temperature, both butters do part of a wax's job in the jar. In a lip formula, a useful workshop rule is that swapping roughly 10 points of liquid oil for murumuru lets you take about 1 to 1.5 points off the beeswax while keeping the same firmness at 20 C. Ten points of shea does nothing like that, and ten points of coconut oil actively softens the stick.

The same stick built with the butter replaced by liquid oil needs beeswax at around 11.5 percent to feel equally firm in the tube, and it will feel duller going on. Run the arithmetic for other batch sizes through the wax ratio calculator rather than by hand, and note the pour temperature: these butters need a hot pour and a fast chill, for the reasons set out below.

Usage rates by product

Five to twenty-five percent covers almost every sensible use, with the product deciding where in that band you land.

Above about 25 percent the trade goes the wrong way: the product becomes chalky-hard in the container and disappointingly thin on the skin, because there is so little left solid at 35 C to give body. If you want hardness that persists at skin temperature, that is a job for a stearic butter such as kokum or for cocoa butter, not for a lauric one.

The hair claim deserves a careful sentence. The best evidence for a plant fat doing something measurable to hair concerns coconut oil, where published work found it reduced protein loss in a way mineral oil and sunflower oil did not, attributed to lauric acid's affinity for hair keratin and its low molecular weight. Murumuru and tucuma have a comparable lauric content, so the extrapolation is chemically reasonable, but it is an extrapolation. No equivalent study exists on these two butters, and a product claim should say what it can support.

Grain, post-hardening and the cooling schedule

These are among the lower-risk butters for graininess, and the reason is compositional. Grain is a minority high-melting triglyceride fraction crystallising separately into crystals large enough to feel, which is exactly what happens in shea because shea has an unusually wide triglyceride spread. Murumuru and tucuma are dominated by two short saturated acids in a fairly uniform set of triglycerides, so there is no distinct high-melting minority sitting around waiting to separate out. In practice, they behave more like the low-grain group described in butters compared than like shea.

Low risk is not no risk, and the failure mode here is different: post-crystallisation. Lauric fats set first into the unstable alpha form and then convert, over hours to days, towards the finer beta prime form, which is smoother but denser. A batch that felt correct on the evening it was poured can be noticeably harder, and occasionally slightly sandy on the surface, a week later. The mechanism is the same one described in fat crystal polymorphism, and if your batches keep stiffening after filling, balm hardens over time is the page that matches the symptom.

Slow ambient cooling in a warm workshop is the reliable way to produce the coarse crystals you are trying to avoid, and repeated warm-cool cycling in storage will undo a good set. Slow cooling grows fewer, larger crystals in any fat, and these two are no exception.

Shelf life: what oxidises, and what does not

An iodine value of 10 to 20 means there is very little in these butters for oxygen to attack. Iodine value counts double bonds, and with 3 to 5 percent total unsaturation on a mostly saturated backbone, murumuru and tucuma sit alongside coconut and palm kernel as the most oxidatively stable fats in a balm maker's cupboard. Two years unopened, stored cool and dark, is a realistic expectation, and adding tocopherol does very little for the butter itself, though it is still worth having for the polyunsaturated oils around it. The background is in rancidity and oxidation.

The failure mode they do have is hydrolytic rather than oxidative. Water plus a lipase, whether from residual enzyme activity or from microbial contamination, cleaves fatty acids off the glycerol backbone, and free lauric and myristic acid taste and smell of soap. This is the same chemistry that makes poorly stored coconut products go soapy, and in a lip product it is unmistakable. It is a strong argument for dry equipment and dry containers, and if the fault has already appeared the diagnosis is in lip balm tastes soapy.

Refined, unrefined, colour and smell

Unrefined murumuru is off-white to pale yellowish grey with a faint, slightly sweet, nutty aroma. Unrefined tucuma kernel butter is similar, sometimes a touch paler. Neither carries anything like the smoky character of unrefined shea or the chocolate of natural cocoa butter, so the usual reason for refining is largely absent. Refined grades are white and effectively odourless.

The argument for buying unrefined is weaker here than for shea for a second reason. Shea's case rests on its unsaponifiable fraction, which is unusually large. These butters carry only about 1 to 2 percent unsaponifiables, so refining removes proportionally little of interest. Choose unrefined if you want the faint natural scent and the story, refined if you are building a precise fragrance or need lot-to-lot colour consistency. Both perform the same in a formula. What you should check on either is the certificate: melting point by slip point, iodine value, free fatty acid content and peroxide value, as set out in sourcing ingredients.

Where they come from, and what the claims mean

Both species grow wild across the Amazon basin rather than in plantations. Fruit is gathered by riverine and Indigenous communities, the kernels cracked and pressed, and the butter moves through cooperatives and consolidators before it reaches a cosmetic supplier. That is a genuinely different supply chain from a commodity oil, and it is the basis of most of the marketing attached to these ingredients.

None of the usual phrases are defined terms. Wild-harvested, sustainably sourced and supports the forest economy carry no standard, no audit and no legal meaning, which is the broader problem with unregulated ingredient marketing. What does have legal meaning is access and benefit sharing. Brazilian Law 13.123 of 2015 governs access to genetic heritage and associated traditional knowledge, with registration through the SisGen system, and users placing such material on the EU market fall under Regulation 511/2014, which implements the Nagoya Protocol. A supplier who can produce a SisGen registration and a due diligence declaration is telling you something checkable. A supplier who can only produce adjectives is not.

One labelling wrinkle. Both palms are members of the palm family, so a strict reading of a palm-free claim excludes them, along with coconut. Most makers use palm-free to mean free of palm oil and palm stearin from Elaeis guineensis, which is the deforestation issue people actually mean, but the ambiguity is real and a customer may challenge it. If you make the claim, define it on the page, and see palm-free balm for how the substitution is normally handled.

Are they worth the money

Both cost several times what cocoa butter costs per kilogram and a good deal more than kokum, so the question is what you get that the cheaper fats cannot give. The answer is narrow and real: the sharp break at body temperature. Nothing else in the plant butter range is that hard at 20 C and that completely melted at 35 C. If the product is judged on how it feels in the first two seconds, a lip balm, a cleansing balm, a hair butter, that property is the product and the price is justified.

For anything else, the cheaper fats win on the merits. If you want hardness that persists on warm skin, kokum is harder, more stable and less than half the price. If you want a lasting film and snap in a stick, cocoa butter does it better. If you want cushion, shea does it better. If you want oxidative stability alone, coconut and palm kernel are cheaper lauric fats with the same iodine value story, and the exotic hard butters in illipe, sal and ucuuba cover the high-melting end. Buying murumuru because it appears on a list of luxury butters, and then using it at 5 percent in a shea-heavy body balm, spends the money and delivers almost nothing you could pick out blind.

Between the two, treat them as interchangeable and buy on price and availability. Tucuma tends to run slightly higher in lauric acid and murumuru slightly higher in myristic, which makes murumuru marginally the firmer of the pair, but the difference is smaller than the lot-to-lot variation in either. If you have never used a lauric butter, buy one of them, make the same lip balm at 8, 14 and 20 percent, and the trade-off between firmness in the tube and thinness on the lip will teach you more than any specification sheet.

Reviewed and updated 6 September 2026. Spotted an error? Tell us and we will fix and log it.