It Says "Contains" — But It Might Be Only 0.001%

"Contains hyaluronic acid." "Contains ceramides." "Contains vitamin C derivative." When you see these claims on a package, do you assume a meaningful amount is inside?

The word "contains" has no concentration requirement. Whether it's 0.001% or 10%, both qualify as "contains."

How Ingredient Lists Work

Under Japan's cosmetics labeling rules: ingredients at 1% or above are listed in descending order; below 1%, they can appear in any order. This means that in the latter half of an ingredient list, order is meaningless — and there's no way to tell which ingredients are at 1% and which are at 0.001%.

Phenoxyethanol: A Useful Benchmark

The preservative phenoxyethanol has a regulatory maximum concentration of 1%. By checking where phenoxyethanol appears on the ingredient list, you can get a rough sense of the "1% line."

Why "Contains" Can Be Meaningless

When "contains hyaluronic acid" is splashed across a product's front label, most people assume it's a star ingredient. But in reality, it might account for less than 0.01% of the total formula. The gap between consumer expectations and reality is the real problem.

A Comparison with Food

Food products are required to display nutritional information with exact quantities. Yet cosmetics have no such transparency regarding amounts. "Contains" proves existence, not efficacy.

Becoming a Smarter Consumer

1. Make a habit of checking ingredient list positions — Check whether your target ingredient appears before or after phenoxyethanol.

2. Reward brands that disclose concentrations — A brand that shares specific numbers is demonstrating confidence in its formulation.

3. Don't place too much weight on "contains" — What matters is how much is inside and how the ingredients work together.