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Vitamin D3
Vitamin D3
Vitamin D3

**Based on a poll of 102 women who used the Advanced Trichology Product Line for 6 months.

83%

Noticed Hair Regrowth*

85%

Noticed a Reduction in Shedding*

89%

Recommend to Friends & Family*

Zone 2TM

Vitamin D3

Balancing cycles, boosting resilience

The high-bioavailability Vitamin D3 supplement supports not just hair nutrition, but the whole immune system. D3 helps restore healthy hair growth cycles, especially for those experiencing temporary hair shedding. A vitamin in methylated form for long-term support of hair and skin health.

Vitamin D3
D3 + K2

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Supplement Facts
Vitamin D3

Vitamin D3

$74.85 $24.95
$24.95 $21.21

100% No-Risk. Money Back Guarantee.

Real results,
trusted by thousands.

Through personalized Advanced Trichology treatments, thousands have achieved real hair growth—even after everything else failed.

Before
After 90 days

“I had tried everything and given up when I found Advanced Trichology. At first I thought nothing was happening, but I stuck to the plan and my hair actually grew back!”
 

Before
After 180 days

“Hair loss is stressful, scary, and heartbreaking so I wanted to provide an early review so others, like myself, can have a bit of a sigh of relief. I’m happy with my experience.

“I was losing confidence along with my hair, but after a few months on the Advanced Trichology routine, I started seeing new growth. My before-and-after photos still surprise me.”
 

“My shedding slowed down first, then I noticed baby hairs coming in. It’s the first time in years I feel hopeful about my hair.”

“I used to avoid bright lighting because my scalp showed so much. Now my hair looks fuller and healthier, and friends keep asking what I changed.”

“I followed the plan exactly and the results were worth it. My hair feels stronger, my part looks smaller, and I finally see real regrowth.”

“I bought the products out of desperation, but they exceeded my expectations. My hair is thicker, my scalp feels better, and my confidence is up.”

“I could see my hair thinning in photos, which was heartbreaking. After sticking with Advanced Trichology for a few months, the change has been dramatic.”

“My stylist noticed the improvement before I did. She said my hair looked fuller and healthier — and now I can see the difference in every picture.”

“I wasn’t expecting fast results, but consistency really paid off. My hair is growing again, and my scalp isn’t irritated anymore.”

“The transformation has been incredible. I went from visible thinning to a fuller head of hair, and I’m more confident going out without hats.”

“I was skeptical because I’d tried so many things, but this is the first routine that made a visible difference. My hair looks fuller and feels healthier than it has in years.”

“I used to dread washing my hair because of how much I’d lose. Now the shedding has slowed down, and I’m actually seeing new growth in the spots that worried me the most.”

“I didn’t expect my before-and-after photos to look this different. My hair feels thicker, my part has filled in, and I finally feel like myself again.”

“My confidence took a hit when my hair started thinning, but sticking with the plan changed everything. My scalp isn’t showing anymore, and my hair looks strong and full.”

“I had patchy thinning around my temples, and now those areas are filling back in. It feels amazing to finally see progress.”

“My thinning was getting worse every month, and it really scared me. After staying consistent, I started seeing small improvements that turned into big ones.”

“I kept seeing progress month after month — less shedding, healthier strands, and now actual regrowth. I’m honestly thrilled with the results.”

Product Details

Key Benefits

Helps Correct Vitamin D Deficiency

Vitamin D deficiency is common and can quietly disrupt hair growth cycles. This formula helps replenish optimal levels to support long-term regrowth.

Supports Hormonal & Thyroid Health

Vitamin D plays a key role in balancing androgens and supporting thyroid function—both critical for addressing DHT-related hair thinning.

Encourages a Healthy Immune Response

Promotes immune system balance and supports a scalp environment more favorable for healthy hair growth.

Liquid Delivery for Better Absorption

No capsules or tablets—just one daily dropper delivers fast-acting, bioavailable support you can feel.

Ingredients

Vitamin D3 (Cholecalciferol) MCT Oil (Medium Chain Triglycerides)

Understanding The Science

This Product Targets Zone 2 Hair LossTM

Not sure if this product is right for you?

Take the Zone Hair Loss Test™

At Advanced Trichology, we’ve identified three scientifically validated root causes of hair thinning: hormonal (DHT), nutritional deficiencies, and inflammation. These underlying causes show up in predictable zones on the scalp, allowing us to pinpoint the true source of your hair loss—and treat it with precision.

Zone 1TM
Hormonal Hair Loss

When testosterone is converted into DHT (dihydrotestosterone), it can shrink follicles and shorten the hair growth cycle. This hormonal imbalance is most often seen at the temples and crown—and is the leading cause of hair loss in both men and women. Our DHT-focused solutions help block this conversion and protect follicles over time.

Zone-Specific Benefit Studies

Gut Barrier Integrity

Henderson, Li, Truong, 2025

Cardiovascular Health

Evans, Nguyen, Fernande, 2024
Zone 2TM
Nutritional Hair Loss

Lack of essential vitamins and minerals like iron, D3, and biotin can silently starve hair follicles—leading to excessive shedding and slow regrowth. Nutritional deficiencies are often reflected in thinning along the sides and back of the scalp. Our targeted nutraceuticals are designed to restore these critical nutrients at clinical strength.

Zone-Specific Benefit Studies

Gut Barrier Integrity

Henderson, Li, Truong, 2025

Cardiovascular Health

Evans, Nguyen, Fernande, 2024
Zone 3TM
Inflammatory Hair Loss

Scalp imbalance can disrupt healthy hair growth at the root. When the scalp becomes irritated—due to stress, immune changes, or product buildup—it can reduce blood flow and compromise follicle health, leading to shedding or thinning. At Advanced Trichology, we address this using a combination of calming botanicals, probiotics, and targeted nutrients that help support your body’s natural inflammatory and immune responses—both topically and internally—to promote a healthier scalp environment.

Zone-Specific Benefit Studies

Gut Barrier Integrity

Henderson, Li, Truong, 2025

Cardiovascular Health

Evans, Nguyen, Fernande, 2024

How to use

Take 5 drops daily under the tongue or as directed by your healthcare provider.
For Best Results: Use consistently for a minimum of 3-4 months.

Join thousands taking charge
of their hair growth experience

Lydia
Zone 2TM
Zone 3TM
Drea

DHT Blocker, FoliGROWTH and Derma-IRON

Aubrie
Zone 2TM
Andrea

FoliGROWTH, Derma-IRON and HairStem DHT Blocker Shampoo

Susan
Zone 2TM
Zone 3TM
Rachael

FoliGROWTH, Derma-IRON and HairStem DHT Blocker Conditioner

Lindsey
Zone 2TM
Zone 3TM
Lindsey C.

DHT Blocker, FoliGROWTH, NutraM and FoliGROWTH Serum

Lydia
Zone 2TM
Zone 3TM
Drea

DHT Blocker, FoliGROWTH and Derma-IRON

“Your products are amazing. You saved my life, and you saved my confidence—I finally feel like myself again. I’ve tried so many things over the years, but nothing worked like this. I tell everyone about it.”

The Solution:
Rx
DHT Blocker with Immune Support
daily
/
+
nightly
Rx
FoliGROWTH Ultimate Hair Nutraceutical
+
daily
Rx
Derma-IRON
for Hair Growth
+
daily
Zone 2TM
Aubrie
Zone 2TM
Andrea

FoliGROWTH, Derma-IRON and HairStem DHT Blocker Shampoo

“This was the only product that made a noticeable difference. My hair started to come in fuller, thicker, and healthier—and I could feel it. I’m so thankful to have found something that actually works.”

The Solution:
Rx
FoliGROWTH Ultimate Hair Nutraceutical
+
daily
Rx
Derma-IRON
for Hair Growth
+
daily
Rx
HAIRSTEM DHT Blocking Shampoo
quarter-sized to wet scalp
daily
Zone 2TM
Susan
Zone 2TM
Zone 3TM
Rachael

FoliGROWTH, Derma-IRON and HairStem DHT Blocker Conditioner

“I've taken FoliGROWTH every day for five months, and the bald spot is almost completely grown back. I cannot recommend this product enough—this has completely changed the way I feel about myself. It's a total confidence booster.”

The Solution:
Rx
FoliGROWTH Ultimate Hair Nutraceutical
+
daily
Rx
Derma-IRON
for Hair Growth
+
daily
Rx
Scalp Therapy Conditioner
to scalp & massage for 1–3 min
daily
Zone 2TM
Maria
Zone 2TM
Zone 3TM
Lindsey C.

DHT Blocker, FoliGROWTH, NutraM and FoliGROWTH Serum

“It was great finding something that works and knowing it was specialized for me.”

The Solution:
Rx
FoliGROWTH Ultimate Hair Nutraceutical
+
daily
Rx
DHT Blocker with Immune Support
daily
/
+
nightly
Zone 2TM

Quick Start Bundles

Men 18-29
Men 18 - 29 Hair Growth Bundle
Shop Now
Men 30+
Men 30+ Hair Growth Bundle
Shop Now
Women 18-34
Women 18 - 34 Hair Growth Bundle
Shop Now
Women 35-49
Women 35 - 49 Hair Growth Bundle
Shop Now
Women 50+
Women 50+ Hair Growth Bundle
Shop Now

FAQs

Hair health is whole
body health.

Frequently asked question about hairloss

Find Your Reason for Hair Loss
What is Biotin and does it matter in treating hair loss?

Question and Answer: Biotin for hair loss? Does it matter?

How do nutrients, or lack thereof, impact hair growth?

Nutritional Hair Loss - How Does It Work?

Is age a factor in hair regrowth?

Is Age a Factor in Hair Regrowth? Reserving Age Related Hair Fast With William Gaunitz

How did Advanced Trichology develop this system?

Natural Solution Of Hair Regrowth - Kathy Ireland Featuring William Gaunitz WTS

Does this treatment work for Women?

Hair Loss Treatment for Women with Advanced Trichology

Does this treatment work for Men?

Hair Loss Treatment for Men with Advanced Trichology

Customer Reviews

Overall rating: 4.7 / 5 from 6073 reviews.

I would recommend this for the rest of my life. The best vitamin product for hair.

FoliGROWTH®

I've used this product for getting my hair back in shape and keeping it that way! Great product..

FoliGROWTH®

It works!

DHT BLOCKER

I have been trying and trying to get this product stopped I cannot afford them and I will get an attorney

DHT BLOCKER

Decent product. Been using after wash from nizoral because it can be pretty drying to the scalp. Adds almost to much moisture even with less sprays as instructed. Makes it look more oily and flat rather then “fuller” as product describes.

Hairstem™ Peptide Spray

I never leave reviews but, I had to come back after 2 months of using this product and let me tell you. My hair has thickened so much since I started using these supplements. I see a 95% reduction in hair shedding and my hair has grown a lot. Thanks to this company. I recommend anyone to try this product out...

DHT BLOCKER

Just stared 30 days ago.

FoliGROWTH®

I like my hair is thicker

EFA COMPLETE

It works

DHT BLOCKER

Received product today

FoliGROWTH®

I really like the spray for I between shampoo and conditioner

Hairstem™ Peptide Spray

Satisfied

DHT BLOCKER

Love this product. Definitely seeing the results!

FoliGROWTH®

Recommend by my trichology being taking for 6 months and we can see progress. Very happy

FoliGROWTH®

As a result of using a special DHT shampoo plus this DHT supplement, I have seen quite a big difference in several months of use on my hair resulting more thickness, longer and softer feel. I am very satisfied so far with this product and only continued use will definitely be rewarding....

DHT BLOCKER

I have seen how the DHT Blocker has filled in my scalp where previously there was no hair! This complex really works!! Thank you!! A. Utley

DHT BLOCKER

Love it!!! This spray gives so much volume and makes my hair so soft!!

Hairstem™ Peptide Spray

It has made a huge difference in my hair’s growth and overall look and feel. Thank you for a great product!

DHT BLOCKER

Arrived on time 🙂

DHT BLOCKER

Easy to take, so far been on ot 3 months, seeing some improvement, will do another 3 months.

DHT BLOCKER

I’ve been using this product for a couple months now and I can see some improvement in my receding hairlines.

FoliGROWTH®

I've experienced less loose hairs on my pillow and in the shower. It seems to me that the product is working well

FoliGROWTH®

This is the best form of vitamin D/K in my mind. Has made a nice improvement in my hair growth. I will always continue to buy this. I also like that it’s in liquid form.

Vitamin D3

Hair regrowth thick and quick at my crown

DHT BLOCKER

Estoy iniciando a usarlo pero tengo muchas expectativas, he escuchado buenos comentarios

DHT BLOCKER

Muy buen producto he visto buenos resultados con menos caída de pelo

FoliGROWTH®

Good product

DHT BLOCKER

I had been taken it for 4 month I started seem differences that look incredible.

DHT BLOCKER

Happy and really has helped with my hair and health highly recommended

DermaIRON

Customer photo review of DHT BLOCKER

GLP1 hair loss- I had NO warning this was a major contraindication until there was literally hair all over my house and not on my head anymore. I started on Advanced Trichology DHT Blocker and Foligrowth, and the NutraM scalp serum in July 2025 (before pic), results were very noticeable by Feb 2026 (after pic). Pictures say it all.

DHT BLOCKER

Customer photo review of DHT BLOCKER

I've been using this DHT blocker for about 2 months now. I see new growth on the front of my scalp all the way down to the side of my face. I may have it all over my scalp but I can't really tell. I would highly recommend this product.

DHT BLOCKER

Customer photo review of Hairstem™ Peptide Spray

After 1 month, my hair has a lot more volume than ever before. Highly recommend to everyone who wants to improve thair hair. Great product would rate it seven starz 🌟🌟🌟🌟🌟🌟🌟

Hairstem™ Peptide Spray

I have Lupus and tend to get bald spots. I have had some regrowth, and all of the bald spots have filled in, so I am quite happy about that!

DHT BLOCKER

Not sure if this product actually works yet. Ive only been using it for a week

Hairstem™ Peptide Spray

Really good taste thank you

Vitamin D3

Doesn't work get worse

FoliGROWTH®

I have to say I think it's working. I noticed a difference in the first 2 weeks. I am about to start my 3rd bottle and I feel like it has helped me to not lose my mind. I was losing hair as if I had chemo treatments but not it is more like 4 to 5 hairs a day. I am suffering from a scalp issue now but am about to see a dermatologist to find out what it is.

DHT BLOCKER

Hair volume has improved

DHT BLOCKER

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