“Backed by research”: what does it actually mean?

It grew hair in the laboratory. Will it work on your scalp?

If you have been looking into hair-loss treatments, you will probably have come across a product described as “scientifically proven” or “backed by research”.

That sounds reassuring. When you are worried about your hair, you want to feel that what you are buying has a reasonable chance of helping.

I always ask a little more. What did the research actually involve? Was the treatment tested on people with hair loss? Or were the researchers studying cells in a laboratory?

Both can give us useful information, but they tell us different things.

I have been reading a recent paper about how scientists study pattern hair loss (androgenetic alopecia). This is the gradual thinning many men and women experience, often with a receding hairline or thinning crown in men, or a widening parting in women.

The paper explores how researchers investigate what happens to our hair follicles, and how they test ideas for possible treatments. It is an interesting glimpse into the work behind the headlines.

Studying cells in the laboratory

Some research is on cells grown in a laboratory.

A hair follicle is the tiny structure in the skin that produces a hair. At its base is a small structure called the dermal papilla, whose cells help control hair growth. Researchers can study dermal papilla cells in isolation, looking at how they respond to hormones or to a substance that might become a treatment.

They might find that an ingredient helps the cells survive, or changes a signal involved in hair growth.

That could be an encouraging finding. But it does not yet tell us whether applying that ingredient to someone’s scalp will help their hair.

These cells are only one part of the follicle. In the scalp, they have neighbouring cells, a blood supply and a whole body around them. A treatment has to work within those surroundings too.

Studying hair growth in animals

You may have seen photographs of mice with patches of hair growing back after treatment. I know many of you won’t like to think about animals being used in research, and nor do I. But animal studies are still part of the development of many potential hair-loss treatments.

Animal studies allow researchers to examine what happens in a living body. But mouse hair grows and cycles differently from ours. The gradual thinning that develops over years in a person is difficult to recreate fully in a mouse.

So those photographs can give researchers a reason to investigate further. They cannot tell us what result a person should expect.

Studying human hair follicles outside the body

Scientists can also study human hair follicles outside the body.

I find this particularly interesting. They can keep a follicle alive for a short time and watch how it responds to a substance. This allows them to study an actual human follicle, with much of its structure still in place.

There are limits, though. The follicle is no longer in someone’s scalp, and it cannot be kept alive indefinitely. A short experiment cannot show whether a treatment will remain helpful and safe over months or years.

Building models closer to living tissue

The paper also describes newer ways of growing cells together to make something closer to living tissue. Researchers are trying to recreate more of what happens in the scalp, so they can make better judgements about which ideas deserve further study.

There is a great deal of careful work involved. Reading about it made me appreciate how many questions sit between an interesting laboratory result and a treatment we can confidently offer to people.

What about studies in people?

For someone choosing a hair-loss treatment, I think it helps to ask a few straightforward questions.

Has it been tested in people with my type of hair loss? How many people took part? Was there a comparison group, so we can judge whether the treatment made a difference? Did the improvement amount to something people could actually see? And what happened with longer use?

I would also want to know whether the product being sold was the one tested. A study of an ingredient does not tell us that every serum containing it will give the same result. The amount used and the way it is prepared may be different.

So what does “backed by research” mean?

“Backed by research” can cover anything from an early experiment with cells to a huge study involving large numbers of people with the condition being treated.

You should not need to become a scientist to choose something for your hair, but it could be helpful to think about what the claim means for the product you are considering.

I enjoy reading about new possibilities. I love to see more effective treatments become available, and laboratory research is an essential part of getting there.

In the meantime, we can be interested in a finding without feeling we need to buy the product and use it.

When I read that a substance has been shown to grow hair, I want to know: was that in cells, in mice, or in people? If it was in people, how many took part and was there a comparison group?

Because these details matter.

Perhaps next time you see a “backed by science” claim in an advert or on a box, you might find yourself wanting to know a little more before choosing it.

Reference: Zhang M, Zhang G, Zhang W, Zhang Y and Xu Y (2026). Advances in androgenetic alopecia model research. Frontiers in Pharmacology, 17:1935819. Read the paper.