★★★★★
4.9 · 2,400+ reviews
Josh McInally.
Founder of Roots
I Spent A Year Learning Why Hair Falls Out. It Comes Down To 4 Things.
I spent a year reading everything I could find on why hair falls out, expecting one answer. There were four.
Stress, hormones, thyroid, and structure. Different causes, and each one needs something different. Biotin is fine. It's just covering one quarter of the problem.
So we built Roots to cover all four. Ten ingredients, one capsule, made in the UK and third-party tested. Here's each cause and what goes with it.
Learn more →
10K+
Dr. Sarah Mitchell, PhD
8 min read • Updated August 2026
01 / 05
Stress doesn't make hair fall out straight away. That's why nobody connects the two.
Stressed Scalp
Under stress your body triages. Hair isn't essential, so follicles get pushed into their resting phase early. Then they sit there for two or three months before letting go.
That gap is why nobody spots it. The stressful thing is over, hair starts coming out in the shower, and you go looking for what changed this week. Nothing changed this week. It changed in March.
What keeps them stuck is the inflammation stress leaves behind.
That's why Roots has curcumin in it. Curcumin is the active compound in turmeric and one of the most studied anti-inflammatory compounds there is. Bring the inflammation down and you take away the thing holding those follicles in the resting phase, so they can cycle back into growth. Roots pairs it with black pepper, which is what gets it absorbed.
Sounds like you if: the shedding started a few months after a hard stretch, and it's thinner all over rather than in one patch.
02 / 05
Hormones don't thin your hair evenly. They go for one specific place first.
One Side Thinner
Than The Other
Going through changes, after a baby, perimenopause, or just getting older. When hormones shift, your follicles get a different set of instructions.
They don't stop. They shrink. Each cycle the hair comes back finer and shorter, until it's barely there. That's why this one is a parting that's got wider and a ponytail that's thinner in your hand, rather than hair in the drain. Nothing fell out, so there's nothing to point at. What's driving it is DHT.
That's why Roots has pumpkin seed extract in it. It contains compounds that interfere with the enzyme that converts testosterone into DHT. Less DHT reaching the follicle means less of the signal telling it to shrink, so hair can keep coming back at full thickness instead of a bit finer each time.
Sounds like you if: your parting has widened, your ponytail feels thinner, and you can't name a moment it started.
03 / 05
Your thyroid decides how fast hair grows. Most people never think to check it.
Thyroid-Friendly
Nutrients
Your thyroid sets the pace of everything, including how quickly follicles cycle. When it slows down, hair growth slows with it. Strands come through thinner and drier, and they stay in the resting phase longer before they're replaced, so you lose more than you're growing back.
It rarely shows up alone. It usually comes with being cold, being tired, dry skin, and outer eyebrows that have quietly thinned.
That's why Roots has iodine in it. No iodine, no thyroid hormone. Give your thyroid the material it's short of and it can run at normal speed again, which is what sets the pace your hair grows at.
Sounds like you if: your hair grows slowly and feels dry, and you're colder and more tired than you used to be.
04 / 05
You brush
It breaks
Some hair isn't falling out. It's snapping off before it gets anywhere.
There's a version of thinning that has nothing to do with follicles. The hair grows fine. It just doesn't survive.
Hair is mostly keratin, and keratin needs the right building blocks to come through strong. When it's short of them, strands come through weaker and hollower, and then everyday life finishes them off. Brushing, tying it up, heat, a pillowcase. It breaks mid-length, so nothing ever gets past a certain point and your ends look thin while the roots look fine.
That's why Roots has marine collagen in it. Collagen breaks down into the amino acids your body uses to build keratin, so new hair comes through with more strength in the strand itself. Stronger strands take the daily wear without snapping, which means the growth you're already making actually stays on your head.
Sounds like you if: you're finding short broken pieces rather than long hairs with a root on the end, and your hair seems stuck at a length.
CUSTOMER RESULTS
88%
EXPERIENCED
THICKER HAIR
81%
LESS
SHEDDING
74%
STRONGER
HAIR
66%
OF HEAT
DAMAGE UNDONE
*Based on a survey of 121 users in 2026
What Our Customers Are Saying
Darcy K, 36
Verified Buyer
"I ticked two of the four causes and had no idea either of them were a thing. I'd just assumed it was age. Four months in - less on the brush and it's holding better when it's up. The reason I bought it was that I didn't have to diagnose myself first, it covers all of them."
Richard G, 59
Verified Buyer
"So pleased with the results. I didn't quite know what was causing my shedding and I heard roots would cover me. Bought the 3 pack and I'm on my 2nd. Not scared for wash day anymore!!"
First batch sold out in 2 weeks
Transform Your Hair
In Just 90 Days
Our scientifically-backed formula combines 10 ingredients to cover the 4 causes of hair loss. Join thousands who've discovered healthier, fuller hair.
🔬 Clinically based: Formula backed by science
🌿 Natural Ingredients: Potent botanicals and nutrients
☑️ 90-Day Guarantee: Risk-free satisfaction promise
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LOW STOCK ALERT
Jane A., 49
VERIFIED CUSTOMER
"So pleased with the results. I didn't quite know what was causing my shedding and I heard roots would cover me. Bought the 3 pack and I'm on my 2nd. Not scared for wash day anymore!!"
10K+
HAPPY CUSTOMERS
5000+
FIVE-STAR REVIEWS
5 YEARS
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Chania Z
Roots subscriber for 12 months