- Research-backed Probiotics For Hair Growth + Biotin 10,000 mcg. We hand-selected 4 probiotic strains studied for their role in supporting hair and skin health: Lactobacillus reuteri HR7, Bifidobacterium longum, Bifidobacterium lactis, and Lactobacillus acidophilus - then paired them with 10,000mcg Biotin for a complete daily formula designed for women and men experiencing thinning hair.
- The Gut-Hair and Skin Connection - Peer-reviewed research suggests that a balanced gut microbiome plays a direct role in both hair and skin health, influencing how your body absorbs essential nutrients and how your immune system supports hair follicle health and healthy-looking skin. That science is exactly why we built this skin health + hair growth vitamins for women and men.
- Hair Probiotics for Women & Men - Lactobacillus reuteri is one of the most studied probiotic strains for hair health, with studies showing it may support hair follicle development and encourage more hairs into the active growth phase, and promote healthy-looking skin. And it’s just one of the four strains we hand-selected for this mens' & womens multivitamin.
- For All Hair Types - Formulated for women and men experiencing weak, thinning or receding hair. Suitable for all hair textures including straight, wavy, curly and coily hair (types 1A through 4C), and all hair conditions including dry, frizzy, short, long and chemically-treated hair.
- What Makes Us Different - Hair Thickness Maximizer is a USA-based brand with over 10 years solely focused on hair health. Every product we create, from our conscious hair oils to our supplements, is manufactured under the highest GMP quality standards so you can trust exactly what you're putting in and on your body.


Queen Of Nightlife –
Hair, Gut, and Real-Life Energy Support (All in One) 💊✨
Hair, Gut, and Real-Life Energy Support (All in One) 💊✨I’m 58, always on the move, and I try to keep things simple when it comes to staying healthy. If I’m taking a supplement, it has to check a few boxes. Easy to take, fits my lifestyle, and actually supports how I look and feel. This one caught my attention because it combines hair support with probiotics, which makes sense when you think about how much starts in your gut.First, I like that it’s vegan. That’s important to me, and it’s not always easy to find formulas that hit that mark while still being strong on ingredients. The 10,000 mcg biotin is a solid dose, and pairing it with probiotic strains like Lactobacillus reuteri adds a different layer you don’t usually see in standard hair vitamins.Capsules are easy to take, no weird aftertaste, and simple to add into a daily routine, even when I’m traveling or bouncing between projects.Now, this isn’t an overnight miracle. Hair growth and thickness take time, so I look at this more as part of a long game. Supporting scalp health, nutrient absorption, and overall wellness is where I see the value.For the price, this feels like strong value for money, especially since it combines two functions into one supplement.For me, it fits right into that category of “easy to stay consistent with,” which is really what matters long term.
Daniel –
Recommended
This biotin and probiotic supplement is a good addition if you’re looking to support hair health from the inside out, especially with the high 10,000 mcg biotin dose and inclusion of multiple probiotic strains. The capsules are easy to take and don’t have any noticeable aftertaste, which is a plus. After consistent use, I’ve noticed some improvement in overall hair texture and a bit less shedding, though it’s not a dramatic overnight change. I do like the added probiotic blend, as it feels like a more holistic approach compared to standard hair vitamins. The only downside is that results take time and may vary depending on the individual, so patience is key. Overall, it’s a well-rounded supplement that’s worth trying if you’re looking to support thicker, healthier-looking hair.
John & Nicole –
Not enough time to tell, but it seems like the company is on the right track.
I take probiotics regularly for GI and chronic health issues. This product interested me because I know biotin is very good for the hair, and this supplement has a good amount of biotin per pill, but I wasn’t too sure about the probiotic blend they chose, so I decided to do some research on each strain to become better informed. So put on your nerd glasses 🤓 because we’re going to deep dive into evidence of this probiotic blend!Lactobacillus reuteri: This is perhaps the most cited strain in this context:Animal Studies: Research in mice has shown that supplementation with L. reuteri can lead to thicker, shinier coats and increased hair follicle activity in the anagen (growth) phase, often linked to increased oxytocin levels and reduced inflammation.Human Trials: Clinical trials exploring the topical application of L. reuteri for androgenetic alopecia (pattern hair loss) are currently underway to determine if these findings translate to humans.Bifidobacterium longum:Clinical Evidence: Some studies have looked at the use of probiotic mixtures, including Bifidobacterium longum combined with Lactobacillus rhamnosus, as an adjuvant (supportive) treatment for Alopecia Areata. Results have shown potential in reducing the number and surface area of hair loss plaques compared to placebo groups, suggesting an immunomodulatory effect.Bifidobacterium lactis & Lactobacillus acidophilus:Evidence Status: There is limited direct, high-quality human evidence isolating B. lactis or L. acidophilus as standalone treatments for hair growth. While these are common “staple” probiotics for general gut health, their specific impact on the hair follicle remains largely unproven in large-scale human trials, so the verdict isn’t out on these yet, in regards to hair health, but it makes sense why they’d include it in the blend.I believe they chose this blend because of a scientific theory called The Gut-Hair Axis. The theory is that improving gut health, specifically by reducing systemic inflammation and enhancing nutrient absorption, creates a better internal environment for hair follicles to thrive.Its an area of science that looks promising and has a good foundation to support it, but even more studies are needed to test the efficacy of these probiotics. But it really does seem like this company did their homework and is on the right track with the particular blend of probiotics they chose.Unfortunately its difficult for me to accurately rate a supplement like this when I’ve only finished a 1 month supply. Based on the research I did, one would need a minimum of 3-6 months of taking this supplement to truly see if it works for them. Id like to continue taking it and see if it helps me, as I am getting older and struggle with chronic health issues that have lead to issues regarding my hair health. So I am basing my review on what information I can find on the ingredients and their dosing.The pills are very small. Odorless. Easy to swallow, and didn’t mess with my sensitive stomach at all. Overall I’d say it’s a good value, but be prepared to require taking this for up to 6 months before you really start seeing a difference in your hair.
Customer Review –
My edges are finally thanking me
I have been stressed about my hair thinning out, so I picked these up to see if they would actually do something. After two months, I am definitely seeing some new growth around my hairline and my hair feels thicker overall. I love that it combines probiotics with biotin because it feels like I am taking care of my hair from the inside out. My hair breakage has slowed down significantly when I comb it out after a wash. I am honestly so relieved that something is finally working after trying a hundred other products. It is vegan, which was a must for me, and I haven’t had any weird side effects.
East Coast PiratesEast Coast Pirates –
Works almost too wellWorks almost too well
I ordered this because I am trying to see how long I can grow my hair out (female, 48). My hair is already to the tailbone. So I decided to try this supplement formula to see if I could grow hair to my knees. Here’s the thing, maximum hair length is determined by genetics, not vitamins. But your hair won’t get longer if it’s not healthy, because if it is not strong it will break off. Giving your follicles maximum nutrition is one way to tip the scale in your favor.It’s too soon to tell if my hair will grow to my knees, because one month of vitamins is not enough time to make that assessment. What I can say is my fingernails are growing at a tremendous pace. It is actually annoying to me that I need to cut them every 2-4 days. So that is one side effect to report! I am hoping that means my hair is benefitting too, as hair and nails are made of similar proteins. With hair already super long it’s hard to tell if it had gotten any longer, but I think maybe it has.Other features of this supplement are the pills are tiny (compared to typical cellulose capsules, these seem miniaturized) and easy to swallow and there is no taste or odor that I could tell. I like that it contains probiotics, though I already take another probiotic supplement so that might be overkill or unnecessary for me. I’ve not noticed any ill effect outside of the fact I occasionally get a mildly upset tummy after taking my morning handful of supplements, but there could be many reasons for that.The price is consistent with similar supplements and I can find no reason not to recommend this product and brand if you are looking for a boost for your hair and nails.
TaraTara –
Biotin and Hair Probiotic SupplementBiotin and Hair Probiotic Supplement
Biotin and hair probiotic supplement. Vegetarian capsule, one per day..very easy to swallow. I have not had any stomach upset or negative side effects.Non GMO, Dairy Free, Gluten Free… Contains 10,000 mcg of biotin and a probiotic blend providing 10 billion CFU.I haven’t seen any results yet but I will update in a couple of weeks once I have finished the bottle.
Sharon D.Sharon D. –
CGMP certified BiotinCGMP certified Biotin
I like that this is a straightforward biotin supplement without other addons and easy to add into a daily routine. Biotin is commonly used to support healthy hair, skin, and nails, and I was especially interested in it for hair and nail support.What I’ve appreciated so far is that I’ve noticed less shedding, which is the main benefit I was hoping for. Of course, supplements like this usually take consistency and time, so I would not expect overnight results, but I do think this is a good option if you’re looking for a simple biotin product to support healthier-looking hair and stronger nails.I also appreciate that it is made in a cGMP facility. With supplements, quality control matters to me, so that detail makes me feel more comfortable taking it regularly. Overall, this is a nice, easy-to-use biotin supplement with a clean purpose, and I like that it supports hair, skin, and nails without being complicated.
Abul KashemAbul Kashem –
Promising Concept, But Results Take TimePromising Concept, But Results Take Time
I think it’s a well-thought-out formula. The combination of probiotic strains like Lactobacillus reuteri along with a high dose of biotin (10,000 mcg) makes sense, especially considering the growing research around the gut–hair connection.One thing I appreciate is that it’s not just another biotin-only supplement. The inclusion of multiple clinically studied probiotic strains adds a unique angle, targeting nutrient absorption and overall scalp health from within. It’s also vegan and easy to incorporate into a daily routine, which is a plus.That said, this isn’t a quick-fix product. Hair growth and thickness improvements typically take a few months, so patience is key. So far, I haven’t noticed dramatic changes in hair growth yet, but my scalp feels healthier and digestion seems slightly improved, which could be a good sign that it’s working internally.Overall, this feels like a solid long-term supplement rather than an instant solution. If you’re looking for a more holistic approach to hair health and are willing to give it time, it’s worth considering.