Plant and milk exosomes: what to ask the supplier
The word «exosomes» on a label says nothing about origin or quantity. We look at how the sources differ and which questions to ask before buying.
Exosomes have become one of the most visible words on the cosmetics shelf in the past few years. They have also become one of the least transparent: a label names their presence but says nothing about where they came from, how many there are, or how they were obtained. We use the Korean company RNH BIO as the example — it produces exosomes itself and works with both sources at once.
Two sources, two logics
Plant exosomes are obtained from plant tissue. At RNH BIO this is done by upcycling: the raw material is what would otherwise become waste — Japanese hop, coffee fruit, camellia fruit, peppermint, rice, seaweed. For a brand with an environmental story that is not just a raw material but part of a narrative that documents can support.
Milk exosomes are a different matter. They are obtained from dairy material, which puts them closer to the food industry in logistics and control. At RNH BIO, milk exosomes sit in the RX PRO clinic line together with camellia fruit exosomes, while the plant complexes sit in the scalp line.
What a label will not tell you
The name of a source says nothing about quantity. Exosomes are measured as particles per volume, and without that figure two products cannot be compared. The second invisible thing is the method of extraction and purification: it governs both the purity of the preparation and the reproducibility from batch to batch.
The third is markers. The presence of exosomes is confirmed in the laboratory through surface proteins such as CD63. A company that produces exosomes itself can usually show such data. A company that buys the material elsewhere more often refers to a supplier's documents, and that is fine too — what matters is knowing whose document it is.
Why in-house production changes the conversation
When a manufacturer obtains exosomes itself, it has answers about concentration, batch and stability. When it buys them as an ingredient, the answers arrive with a delay and through an intermediary. For purchasing that is not a difference in prestige but in time: every follow-up question grows by one round of correspondence.
At RNH BIO there is a second side to this. The company sells exosomes not only inside its own products but also as a raw material. A buyer can therefore choose: take a finished product, or commission development on the same material.
What to ask before buying
The exosome source for each product separately. The concentration in particles per millilitre and the counting method. The marker used to confirm presence. Stability data: how long and at what temperature. The supply form — liquid or freeze-dried. And the list of claims the company is prepared to support with documents for your market.
That last point matters most. Cosmetic claims about exosomes are regulated differently in Korea, the European Union, Brazil and the USA, and the permitted wording on a label differs even when the formulation is identical.