People With Gray Hair Took PABA and Some Reported Their Hair Color Coming Back in 2–4 Months
What if some gray hair isn’t necessarily a permanent one-way process?
For decades, gray hair has been treated as an unavoidable sign of aging. Once those silver strands appear, most people assume there is nothing they can do except cover them with hair dye.
But there is a fascinating chapter in nutritional history that rarely makes it into conventional conversations about gray hair.
It involves PABA.
PABA stands for para-aminobenzoic acid, and older nutritional literature sometimes referred to it as “vitamin B10.” It is important to clarify that PABA is not considered an essential vitamin for humans today, despite that historical nickname.
Nevertheless, older reports described people taking PABA who experienced a return of pigmentation in some gray hair after several months—with 2–4 months often appearing in accounts of the phenomenon.
This does not prove that PABA reverses gray hair, and modern clinical trials have not established PABA as a reliable gray-hair treatment.
But the story raises a much more interesting question:
Why would hair that has already turned gray ever regain pigment?
Gray Hair Isn’t Simply “Dead Pigment”
The color of your hair comes primarily from a pigment called melanin.
Melanin is produced by specialized cells called melanocytes within the hair follicle. These cells transfer pigment into developing hair fibers, giving them their characteristic color.
As we age, the follicle’s pigment-producing system can become less active. Eventually, newly produced hairs may contain substantially less pigment and appear gray, silver or white.
Genetics are one of the biggest factors determining when this happens. But aging isn’t the only factor researchers have investigated.
Oxidative stress, changes within the hair follicle and certain nutritional deficiencies have all been studied in connection with premature or accelerated graying.
And that’s where nutrition becomes particularly interesting.
The Forgotten PABA Connection
PABA is a naturally occurring compound found in some foods and produced by certain microorganisms.
Historically, PABA was grouped alongside the B vitamins and was sometimes called vitamin B10. Modern nutrition doesn’t classify it as an essential human vitamin, but the old terminology continues to appear in books, articles and supplement discussions.
During the early and mid-20th century, PABA became the subject of nutritional experimentation for a variety of conditions, including changes in hair pigmentation.
Some older reports described individuals with gray hair taking PABA and subsequently developing darker or more normally pigmented hair.
The proposed timeframe was sometimes several months rather than several days—which makes biological sense when you’re talking about hair.
Why Would It Take 2–4 Months?
Hair doesn’t instantly change color after you change something in your diet.
The visible portion of a hair shaft is already formed. Changes in the nutritional environment of the follicle would therefore be expected to affect newly produced hair, rather than magically recoloring the portion that has already grown outside the scalp.
Hair grows gradually, which means any change in pigmentation would become noticeable as new growth emerges.
That’s one reason reports describing changes over a period of months are considerably more biologically plausible than claims that gray hair can suddenly turn dark overnight.
But Here’s the Part Most People Miss
The interesting question isn’t necessarily whether PABA is a “gray hair cure.”
The more important question is whether some cases of premature graying could be influenced by the nutritional environment of the hair follicle.
We already know that several nutrients are important for normal hair growth and cellular function.
Iron, copper, folate, vitamin B12, zinc and other nutrients have all been investigated in relation to hair health and premature graying.
That doesn’t mean taking more of these nutrients will automatically restore hair color. In someone who isn’t deficient, adding more isn’t necessarily beneficial.
But if an underlying deficiency exists, correcting it can be a very different story.
And This Is Where Wheatgrass Gets Interesting
This is where wheatgrass enters the conversation.
Wheatgrass contains PABA along with a variety of other naturally occurring nutrients and plant compounds.
It is also rich in chlorophyll and contains minerals and other compounds that have made it popular in traditional and holistic nutrition.
Wheatgrass has therefore been promoted as a nutrient-dense addition to the diet, including by people interested in supporting healthy hair and overall nutrition.
However, it is important not to confuse the presence of PABA in wheatgrass with proof that drinking wheatgrass will reverse gray hair.
The amount of PABA and other nutrients can vary depending on the plant, growing conditions and preparation. And there isn’t good clinical evidence showing that wheatgrass reliably restores gray hair.
The Oxidative Stress Theory
One of the most intriguing areas of research into graying involves oxidative stress.
Hair follicles are metabolically active structures. During normal cellular activity, reactive molecules are produced. The body has antioxidant systems designed to keep these molecules under control.
Researchers have investigated whether oxidative damage and changes in antioxidant defenses within the hair follicle may contribute to the loss of melanocyte function that accompanies graying.
This is one reason the conversation around gray hair has expanded beyond simply “you got older.”
The follicle is a living biological system, and its pigment-producing cells are influenced by the environment in which they function.
Can Gray Hair Actually Reverse?
This is perhaps the most fascinating part.
Although age-related graying is generally considered progressive, scientists have documented instances in which individual hairs can regain pigmentation.
That doesn’t mean everyone can reverse gray hair. It also doesn’t mean a supplement can bring back the hair color you had at 20.
But it does challenge the overly simplistic idea that every gray hair represents an irreversible biological switch.
Researchers have observed changes in hair pigmentation associated with changes in physiological conditions, which suggests that the pigment-producing machinery of the follicle can sometimes behave in more dynamic ways than previously assumed.
What About Stress?
Stress is another fascinating piece of the puzzle.
Research has investigated connections between significant stress and changes in hair pigmentation. Scientists have proposed mechanisms involving the nervous system, stress hormones and the stem-cell populations involved in maintaining pigment-producing cells.
Again, this doesn’t mean that every stressful period will cause gray hair—or that relaxing will turn gray hair brown.
But it reinforces a broader point:
Hair follicles respond to the body’s internal environment.
Don’t Ignore Nutritional Deficiencies
If someone begins developing unusually early or rapidly progressing gray hair, it may be worth looking at the nutritional side of the equation rather than immediately assuming it’s entirely genetic.
Depending on the individual, a healthcare professional may consider whether there are signs of deficiencies involving nutrients such as:
- Vitamin B12
- Folate
- Iron
- Copper
- Zinc
- Vitamin D
These nutrients have different biological functions, and deficiencies can affect many aspects of health—not simply hair.
The goal shouldn’t be to take every supplement on the shelf.
The goal is to identify what the body actually needs.
Why the PABA Story Still Matters
So, did PABA definitively prove that gray hair can be reversed?
No.
The evidence isn’t strong enough to make that claim.
But the historical reports are interesting because they point toward a broader concept that modern research continues to explore: hair pigmentation is a biological process, not simply a cosmetic feature.
The production of melanin requires functioning cells, enzymes, nutrients and a healthy follicular environment.
When any part of that system changes, pigmentation can change too.
The Bottom Line
PABA—sometimes historically called “vitamin B10”—has a curious history involving reports of improved hair pigmentation after several months of supplementation.
Some people reported seeing their natural hair color return within approximately 2–4 months, but these reports are not enough to establish PABA as a scientifically proven treatment for gray hair.
Wheatgrass is another interesting part of the story because it contains PABA along with other naturally occurring nutrients and plant compounds. But drinking wheatgrass should not be viewed as a guaranteed method of reversing gray hair.
The bigger takeaway is perhaps more important:
Your hair is giving you information about what’s happening inside your body.
Genetics and aging matter. But so do nutrition, cellular metabolism, oxidative stress and the health of the hair follicle.
Instead of automatically accepting gray hair as nothing more than an inevitable consequence of getting older, it may be worth asking a better question:
“What is happening inside the follicle that caused the pigment to change?”
Sometimes the most interesting health discoveries begin with questions that conventional conversations don’t ask.
Note: PABA is not an essential human vitamin, and evidence that PABA or wheatgrass can restore gray hair is limited. Anyone considering PABA supplementation should discuss it with a qualified healthcare professional, particularly because high doses can cause adverse effects.