Balding might make you blue — but this news won’t. 

A recent study suggests that a controversial liquid popular in biohacking and wellness circles could support scalp health and hair growth. 

Researchers say the substance may even hold promise for GLP-1 users with thinning crowns, a frustrating side effect that’s become increasingly common as the blockbuster weight loss and diabetes drugs soar in popularity. 

Originally created as a textile dye, scientists have studied methylene blue for a wide range of medical applications, from treating malaria to counteracting cyanide poisoning.

Today, it’s FDA-approved for methemoglobinemia, a rare blood disorder that affects how oxygen is carried in the body.

In recent years, the vivid blue substance has exploded in popularity among celebrities, wellness influencers and biohackers, who tout it as an anti-aging, mood-boosting and brain-enhancing supplement — though some of the purported benefits lack strong scientific backing. 

Now, researchers at the University of Maryland (UMD) are investigating whether the bright blue liquid may also help revive hair follicles.

Their focus is on human hair follicle stem cells — the tiny but crucial cells that help control the hair growth cycle and regenerate new strands.

As people age, those cells can become damaged by things like ultraviolet radiation, oxidative stress and metabolic problems, leading to thinning hair and an aging scalp.

Scientists have long known that methylene blue acts as a mitochondrial antioxidant, meaning it targets the cell’s energy centers and helps shield them from damaging molecules called free radicals that can trigger oxidative stress and contribute to aging and cell damage.

To see whether that could translate into healthier hair growth, the researchers tested the compound on cultured human hair follicle stem cells in a lab.

They found that methylene blue boosted stem cell growth and survival while lowering harmful oxidative stress inside the cells.

The team also found it switched on a key growth pathway called β-catenin signaling, which helps with hair follicle repair, stem cell health and wound healing.

When paired with minoxidil, a common hair growth treatment, methylene blue appeared to boost that same pathway even more and further improve the survival of hair follicle stem cells.

In additional lab tests, the compound appeared to speed up wound closure and improve regenerative activity in the hair follicle stem cells — a finding researchers say suggests that methylene blue could someday play a role in combating hair thinning and scalp aging.

The study also took a closer look at how the findings might apply to the growing number of people using GLP-1s for weight loss and diabetes management.

An August 2025 survey found that nearly 12% of Americans have tried them, including roughly 1 in 5 women between 50 and 64.

While gastrointestinal issues may be the most well-known side effect, hair loss has also been documented among users.

One study found that people taking semaglutide-based drugs like Ozempic and Wegovy are about 50% more likely to report hair shedding compared to people on another weight-loss medication, bupropion-naltrexone.

Experts believe the cause is largely tied to the rapid weight loss triggered by GLP-1s.

“When you are losing weight, either through a GLP-1 or any other type of weight loss, you may be taking in less nutrients, less protein and the weight loss itself can be a stressor,” Dr. Heather Woolery-Lloyd, a dermatologist and the chief medical adviser for haircare brand Nutrafol, previously told CNBC.

The new research suggests the drugs themselves may also be part of the story.

In lab tests, the UMD scientists exposed hair follicle stem cells to GLP-1s at different strengths and found that the higher the dose, the fewer stem cells survived.

However, when the cells were pre-treated with methylene blue, they were largely protected from that damage, with significantly less stress and cell death observed even under greater drug exposure.

The study authors stressed that their findings come from in vitro cell experiments, meaning they were done in lab dishes rather than in people.

They said more research is needed before any conclusions can be drawn about real-world benefits of methylene blue for hair and scalp health, including what doses might work, whether long-term use is safe and whether the results actually hold up in humans.

Still, the early findings offer a hint of promise. While not dangerous in a medical sense, hair loss can take a real toll on a person’s confidence and well-being, sometimes contributing to anxiety, depression and social withdrawal and affecting overall quality of life.