(This Field Note was written in response to an idea submitted by a reader—thank you, Cristina! If there’s a topic you’d like me to write about, you can reach me at [email protected]. I read and respond to every subscriber email.)

Shampoo might just be the least durable luxury purchase imaginable. You massage it into wet hair, enjoy it for perhaps a minute at most, and then rinse it down the drain. Nothing is left except a trace of scent—and, one hopes, some lasting effect on your hair.

A luxury fragrance will last hours, perhaps all day. A luxury skincare product can remain active all day, even overnight. But luxury shampoo has about a minute to make its case and then disappears. So whatever justifies the premium one pays for it must be mostly attributable to the experience of using it, the condition of one’s hair afterwards, or both.

Three well-known luxury brands, each with a shampoo product at escalating prices of approximately $5, $10, and $15 per ounce, give us a frame to think about luxury shampoos. What do you pay, and what do you get for that price?

For this article, I chose three luxury brands, each from a different national origin, each with a true line of haircare products, not just shampoo with a firm’s scent,¹ and each with a different approach to haircare product formulation.

In each case, I’m comparing the shampoos using their price per shampooing, which typically requires about 10 ml / 0.34 oz. For American readers, that’s about two teaspoons, or a dollop roughly the volume of a one-inch ball—basically a large grape. (People with long or short hair may need more or less; for example, I have relatively short hair and use about 5–6 ml per shampooing.) Note that I’m only calculating the price of the shampoo, not the optional conditioner afterwards, which, if from the same product line, could double the price.

Shu Uemura Art of Hair represents Japanese beauty culture and salon-based haircare. They say that they “fuse unique natural ingredients with trailblazing science, and the experience of the world’s most inspired hairstylists, to offer women everywhere the absolute artistry of beautiful hair”. They also call themselves “the ultimate in avant-garde luxury”. Uh, Pharrell Williams would like a word, but moving on…

Their Ultimate Reset Extreme Repair Shampoo costs $56 for 300 ml, or $5.52/oz. At 30 10 ml shampooings per bottle, that’s $1.87 per shampooing. They say that it “provides intense care without weighing hair down”, and that “the delicate cleanser helps to lift away any dirt, impurities and product build-up while strengthening strands from root to tip to fortify against future hair breakage, leaving healthy hair feeling soft”.

Augustinus Bader is based on German dermatological research. They say their haircare products use “TFC8 technology to optimize your hair’s micro-environment while supporting cellular renewal and natural hair growth”. “TFC” stands for “Trigger Factor Complex… a carefully crafted blend of high-grade vitamins, lipids, and high-performing, proprietary peptides”. It sounds impressive, and to be fair, their founder holds both a PhD and an MD and is a published research scientist focusing on stem cells and regenerative medicine—his biography can be found here.

Their The Rich Shampoo costs $67 for 200 ml, or $9.91/oz. At 20 10 ml shampooings per bottle, that’s $3.35 per shampooing. They say that their technology “guides key nutrients and powerful natural ingredients to the scalp, follicles, and hair, creating and supporting an optimal environment for cellular renewal”, and that it “turns potent base formulations into smarter, adaptive haircare capable of addressing individualized concerns”.

Re-launched as a skincare firm in 1976, Sisley Paris is a thoroughly French entreprise: it designs, develops, and manufactures a majority of its products in France, with its headquarters in Paris and its research and development offices close by.

Their Revitalizing Volumizing Shampoo with Camellia Oil costs $100 for 200 ml, or $14.79/oz. At 20 10 ml shampooings per bottle, that’s $5.00 per shampooing. They say that it “gently cleanses while providing the necessary vitamins and minerals for the vitality of the scalp and the hair” and that its “sulfate-free formula benefits from a combination of effective key ingredients targeting the scalp and hair”.

Three luxury shampoos at price points of approximately $5, $10, and $15 per ounce—or put in per-use terms, approximately $2, $3.50, and $5 per shampooing. Assuming someone is invested enough in their hair care to spend money like this on it, I’d also assume they’d also want to use matching conditioner, which could double the cost. $4 to $10 per session is significant.

The reality is that every maker of technical haircare products—luxury, approachable luxury, or mainsteam—uses similar language about their formulations and the benefits they bring. As consumers, we honestly have no way of evaluating any of this. There’s no standard of efficacy to which haircare products must adhere and no easy way to validate their claims.

I return to what I wrote in “Luxury skincare products: what are you paying for?”:

The same holds true here. If you find a luxury haircare product that you enjoy using, you feel like it improves your hair, and you can afford it, then you can feel good about it. Don’t tell yourself it’s because of science or technology. It might be true, but we have no way of knowing if any of these products are uniquely effective.

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