Grow Fuller, Thicker Hair
World's First Follicle Synergy System™
Fuller Active Hair Serum, 50ml/1.7oz
- Clean, plant-powered science with patented Redensyl®
- Fuller, thicker and healthier hair in as soon as 21 days
- Clinically proven 2X better than leading competitors
- Prevents shedding, stress fall, and graying
Couldn't load pickup availability
Why it's special
Why it's special
- Our Follicle Synergy System™ targets hair growth from every angle
- Clinically proven 2x stronger than Minoxidil
- Twice as many growth ingredients as leading competitors
- Revitalizes and balances the scalp
- Weightlessly volumizes hair
- Promotes follicle health & maximizes density at the roots
- Leaves hair feeling and looking voluminous, healthier and more resilient
How to use & What to expect
How to use & What to expect
We recommend using it for at least 8-12 weeks for full effect, though many feel benefits as soon as 3 weeks. Results may vary.
Apply 1-2 full droppers of serum directly to scalp. Allow 10-15 seconds before massaging with fingertips. Works best on dry or towel dried hair. Do not rinse. Style hair as usual. Apply morning and night for best results.
Key Ingredients
Key Ingredients
We take less profit and therefore have 2x the amount of growth ingredients as leading competitors.
- Patented Redensyl®
- Follicusan
- Biotin
- Saw Palmetto
- Ashwagandha
- Caffeine
- Horsetail
- Pumpkin Seed Oil
See full ingredients list further down the page.
**This product contains active natural ingredients. For those with sensitive + reactive skin, please review the ingredient list with a doctor + consider spot testing ahead of full scalp use.**
90-day Money Back Guarantee
90-day Money Back Guarantee
We’re confident you’ll love your results with KYIR—but we understand that everyone’s journey is unique. That’s why we offer a 90-Day Guarantee for our Fuller Active Hair Serum, designed to give you peace of mind as you commit to your growth routine.
To qualify for a full refund;
1. Use the KYIR Fuller Active Hair Serum consistently for at least 90 days, as directed.
2. Document your progress with clear photos taken monthly.
3. Reach out to us to submit your claim. Once approved, you’ll be asked to return your products.
Return shipping costs are your responsibility at this time.
Please note:
If you do not meet the outlined requirements at the time of purchase, your order may still be eligible for a return—but only for products purchased within the last 30 days only. All returns must include the original packaging and remaining product, if applicable.
Products that have been discarded or bottles that have been thrown away are not eligible for a refund if requrements 1 + 2 aren't met.
A handling fee of $4.95 will apply to all returns and exchanges. Your return will be processed and we will refund the original payment method, less shipping service and handling fees which are non-refundable.
We’re here to support your hair journey every step of the way. If you have questions or need help with your return, don’t hesitate to contact us support@lovekyir.com with your order number and email.
FAQ
FAQ
How long does it take to see results?
- We recommend using it for at least 8-12 weeks for full effect, though many see results as soon as 3 weeks. Results may vary.
Is This For You? If you check any of these boxes, this is for you:
- Your hair is thin and/or thinning
- Hair loss runs in your family
- You have damaged hair or split ends
- Hair falling out from stress, postpartum, medication, etc.
- You have bald spots and alopecia
Will KYIR Fuller Hair Serum make my hair greasy?
- No! It is a fast-absorbing, non-greasy formula, it can be applied to the scalp with wet or dry hair without interfering with styling. in fact ,it makes styling easier while also adding volume
What happens if I stop using your Hair Serum?
- No, your hair will not fall out. But as with any good wellness routine, results require effort to be maintained. If you stop using Fuller Active Hair Serum, you'll see hair return to its natural state within a few months of discontinuing use.
Does it work for all ethnicities?
- Yes, no matter your ethnicity and hair type, KYIR Fuller Active Hair Serum will help in your hair growth journey!
My products have had different colors.
- KYIR uses plant derived preservatives in our clean & clinically effective, small batch formulations. Each batch may vary slightly in color, and may darken with exposure to air & light. This does not indicate that the product is less safe or effective.
Will it help with dandruff?
- Yes! It features a compilation of ingredients that revitalizes, hydrates and refreshes the scalp, keeping it dandruff free.
Can it be used for men?
- Yes, indeed it can. Some of our 3rd party clinical studies were done with men showingthe same efficacy!
Cruelty Free
Paraben Free
Silicone Free
Gluten Free
Phthalate Free
Sulfate Free
★★★★★
Trusted By Industry Experts
Clinical Results
Many of our customers see significant improvement in hair thickness an as few as 3 weeks, and in a 3rd party 90-day clinical study using only our patented Redensyl ingredient these were the results:
AS SEEN IN
AS SEEN IN
The Science
The haircare industry rarely talks about its high markups, often replacing effective ingredients with water and paraben fillers to maximize profits.
Most serums, vitamins, and prescriptions fall short because they only target one or two factors of healthy hair growth—like stimulation or nourishment—while ignoring the rest.
Think of your hair as a factory, where follicles (the workers) need the right tools, materials, and environment to thrive. Ingredients like Biotin, Rosemary Oil, or Minoxidil play small roles, but no single solution addresses the full growth cycle or scalp health.
That’s where KYIR Fuller Active Serum comes in. With double the growth ingredients of competitors, our breakthrough Follicle Synergy System™ and patented Redensyl® formula target every angle—stimulating, nourishing, protecting, and balancing for visibly healthier, fuller hair.
Ingredients
After decades of experience and years of research, our science team has mastered formulating the most potent growth ingredients to work synergistically for maximum effectiveness.
Patented Redensyl®
A breakthrough patented Swiss formulated to help minimize hair loss and wake up hair stem cells to generate growth, Redensyl is a much better and more advanced alternative to its predecessor, Minoxidil. Redensyl has zero known negative side effects and is known to strengthen and thicken hair follicles and improve hair growth tremendously within 90 days of consistent use.
Follicusan
This proven topical hair loss treatment contains a blend of bioactive ingredients, including milk proteins, amino acids, and vitamins that help to increase hair growth and reduce hair loss, and protects the hair follicles from damage. Follicusan is designed to stimulate hair growth and reduce hair loss by activating the dermal papilla cells located at the base of the hair follicle, improving hair follicle function and growth.
Biotin
A well-known hair growth agent, Biotin helps to stimulate keratin production in hair and can increase the rate of follicle growth. Along with preventing hair loss, dandruff and itchy scalp, Biotin also strengthens hair follicles and adds shine.
Saw Palmetto
Native to the southeastern United States, this small palm tree has been used for centuries for its medicinal properties. Recently it has become increasingly popular as a natural hair loss treatment. Containing a number of active compounds, including fatty acids, sterols, and flavonoids that work together to help decrease the production of dihydrotestosterone (DHT), a hormone that can shrink hair follicles and lead to hair loss.
Ashwagandha
As a natural antioxidant with anti-inflammatory benefits, this potent herb helps to strengthen hair follicles and fight free radicals. Ashwagandha encourages the production of melanin in the hair follicle and aids to delay pre-mature greying. Its natural anti-inflammatory properties can help minimize scalp irritation and as a restorative effect on the hair follicle and scalp.
Noticeable hair growth and fullness in as early as 3 weeks
Achieve visibly fuller, healthier hair in as early as 21 days with KYIR Fuller Active Hair Serum. With consistent use, most will unlock their hair’s full potential in 90 days, but we have several cases where our customers see almost immediate results. Remember, building a lasting hair care routine takes daily commitment and patience for the best results.
Day 1
Adds instant root volume, making it easier to camouflage thinning areas. For even greater lift, blow-dry with a round brush to maximize fullness.
Month 1
Hair becomes thicker, fuller, and more vibrant. Paired with our supplement, the results are even more pronounced, enhancing density and health.
Month 3
Growth and density visibly improve, resulting in thicker, fuller strands with enhanced volume and texture. The transformation becomes noticeable to others.
Month 6-12
Your hair becomes healthier, fuller, and denser, with increased length, volume, and a smoother texture. Stronger and more resilient, it achieves a lasting, luxurious transformation.
Customers said this hair serum reduces shedding and promotes growth, with "noticeable volume" and fuller hair. Many reported visible results within weeks, including new baby hairs. The lightweight, non-greasy formula absorbs quickly and works on wet or dry hair. While most love the scent and clean ingredients, some noted it may take longer to see growth results.
Used it for a short time
For now I like it- less hair falling and better hair shine
Will continue to use it
Hi there! We're so glad to hear you're seeing positive results with our Fuller Active Hair Serum. Thanks for sharing your experience, and we look forward to supporting your hair care journey. Enjoy your continued use!
Part of my daily regimen! I love partnering it with STRONGER too.
I have tried everything. This serum was exactly what it said! I took before and after as the email suggested. You have a forever customer :). What a difference!
I have been using the Fuller Active serum for 60 days, and I am truly amazed by the improvement in my hair. I am thoroughly impressed and am now placing my third order. My friends have also noticed the positive changes. If you're looking for a product that delivers results, KYIR is undoubtedly the best option!
We’re so thrilled to hear about your amazing results with KYIR’s Fuller Active Serum! ✨ Stories like yours are exactly why we do what we do — clean, powerful ingredients that actually deliver. The fact that your friends are noticing the difference too? That’s the kind of transformation we love to celebrate! We cant wait to see another 60 days!
WOW is all I can say! And I think you can see why in my pic. This is ALL NEW GROWTH HAIR!! I have been using this serum daily for about 3 or 4 weeks now, particularly focusing along my hairline, and this morning when I woke up with my hair in a bun, I looked in the mirror and was shocked. Thank you so much, KYIR!
Wow, thank you so much for your amazing feedback! We're thrilled to hear about your new hair growth and that our serum is making such a positive impact. It’s fantastic to see the results you've achieved, especially along your hairline.
Thank you for sharing your experience and for your support. If you have any more updates or need further assistance, we're here for you!
Best,
Team KYIR
Being a platinum blonde is hard enough, let alone living a very active lifestyle day to day as a yoga instructor. Kyir has changed the way my hair feels on hair wash day and has played a key role in the way my hair looks and feels on day four! Sweating is part of my every day life and practice but I never have found a serum that does NOT negatively contribute to my hair after my workouts. My platinum has never looked as healthy as it does now! 🖤
I’ve been using Kyir for the past month and it’s really made a huge difference! Starting to see new growth!
I have been using this for 90 days. My hairline is more full and I have small hairs growing in from the front! I love how it gives me volume as well. I do not need a styling product in addition!
I noticed some baby hairs coming out ! I’m going to continue use!
Absolutely must try hair serum!!!!!! Completely obsessed using the product AM and PM. Even my friends are asking about my hair volume and shine. Never knew I even needed the product but so glad I found it LOVE KYIR. I now have baby hairs at my hairline. You'll thank me later. I'm ordering my second bottle because I can't be without my routine.... Run don't walk on ordering yours....
For the past 10+ years I have been bleaching my hair and have always struggled with thin, damaged/brittle hair. I have bought and used just about every hair repair product in today's beauty market, spending thousands with no luck, until I got my hands on Kyir. Using Kyir's hair oil containing of plant based ingredients & Redsenyl has allowed my hair to finally GROW 2-4 inches between bleach sessions leaving it so softer, thicker, and healthier than ever before. My hair dresser was even impressed at the results!!! This is a must buy!!!
My hair has always gone through stages of thinning especially that I’m a guy. I’ve been using this 2 times a day. In the morning and at night and I have to say my hair & scalp health has had such an improvement. I’m super sensitive to so many things so it’s hard for me to trust and use a product. Hair feels and looks fuller, softer & my scalp is cleaner and I don’t feel irritated just amazed!
So lightweight and effective! I use this prior to my pomade and it adds so much volume without feeling heavy. Great scent too!
This serum revives my day-old or gym hair better than any dry shampoo on the market. Just two droppers all over the scalp, a quick blow dry with a round brush, and I’m ready to go (this technique gives awesome volume as seen in my photo). Smells great, has clean ingredients, does everything it promises it will do and more! It’s a permanent resident in my beauty routine from now on. Can’t wait to see how it enhances and encourages growth as time goes by.
I’ve now finished my first bottle and into the next one. Wanted to try this since pregnancy increased my hair loss and started seeing bald spots. I cannot report yet progress on the bald spots but definitely my hair loss is back to normal even in the midst of postpartum/breastfeeding which usually increases hair loss.
Also I’ve received comments that my hair looks very shiny and full overall.
Obsessed with this serum my hair is gradually getting denser I’ve noticed my shedding has decreased and hair feels much fuller! The smell is also addicting and i love that it doesn’t make my hair greasy! The ingredient list is actually impressive!
Really happy with this product! I’ve never purchased a hair serum before but love adding this to my daily routine.
Thank you so much! We love to hear this!
When I found Kyir I was struggling with extreme hair shedding. It felt like I had lost about 40-50% of my hair. I was desperate to find a solution that worked. I'm 6 weeks into using Kyir and I have noticed a difference in my shedding. It has definitely reduced back to normal shedding in the shower. No more big clumps! I have also started to see new little hairs starting to pop up at my widening part. I'm very happy with Kyir and would definitely recommend giving it a try. It is lightning in a bottle! I can't wait to see where my hair will be in another few months from now.
Hi Jana, we're so glad to hear about your positive experience with the Fuller Active Hair Serum! Thank you for sharing your journey — we're excited to see your progress over the coming months. If you need any support, we're here for you! We are cheering you on!
xox Team KYIR