All products featured on Allure are independently selected by our editors.

However, we may receive compensation from retailers and/or from purchases of products through links in this article.

Aging is a privilege, but not everyone feels blessed to receive thegray hairthat comes with it.

side portrait of a woman with long gray hair

Getty Images

For decades, scientistshave been studyingways to slow hairs aging process.

Do any of them actually live up to their promises, though?

Here, we got answers from independent experts.

closed black bottle of arey to the root gray reversal serum

Why does hair go gray?

But its a little more complicated than a simple deficiency.

So sunlight, which carries both UVA and UVB, is a double-whammy for hair damage.

closed bottle of hey hair root revival anti gray hair serum on a gray background

One contributing factor that might be a bit more in our control is stress.

Scientists found that the bodys fight or flight response can contribute to turning hair gray.

Remember those pigment-producing cells, the melanocytes?

closed gold bottle of vegamour gro ageless anti gray serum on a light gray background

Is reversing gray hair possible?

Maybe, especially if youve just discovered your first strands of silver.

We know that during periods of stress, individual hairs on your head can go gray.

closed bottle of Leonor Greyl Serum Energisant for thinning hair on a light gray background

When it comes to reversing gray hair not related to stress, research is limited.

Is there a product available todayother than dyethat can reduce grays?

Were giving you another big maybe here.

closed blue and white dropper bottle of Living Proof Scalp Care Density Serum on a light gray background

The idea here is preserving pigment, says Jay Small, co-founder of Arey.

To back up its claims, Arey cites two studies that were done on palmitoyl tetrapeptide-20 amide.

The trial is promising but was smalland there was no comparison to a placebo or other product.

Dr. Marcus was cautiously optimistic about palmitoyl tetrapeptide-20 amide.

Read more hair stories:

Now, watch this: