Rule Cosmeceuticals Stem Cell Hair Regrowth Serum - 1 fl oz

[This review was collected as part of a promotion.] I have thin, straight hair and tend to notice some hair shedding randomly throughout the year. I used the single bottle of Rule No. 4 that I received from Influenster and applied it consistently as directed. I didn’t see any significant or noticeable regrowth after finishing the entire bottle. However, I did notice slightly less hair loss and an overall improvement in hair vitality. I understand that products like this usually require long-term use and strict consistency to show visible results, so one bottle alone may not be enough to judge its full effectiveness. It may have helped a little, but not enough to deliver significant results in my case. I would consider purchasing one or two more bottles to better evaluate its long-term impact. For now, based on my experience, I’m giving it 3 stars for the pleasant scent, sleek design, easy application, and hair-supportive ingredients. I would recommend it to those willing to invest in longer-term use, with the understanding that “stem cell” in this product refers to plant cell extracts used in cosmetic formulations, not real living stem cells that create or regenerate new hair follicles.

[This review was collected as part of a promotion.] Good product for thinning hair helps to regrow your hair. Seems like a good value for the price, minimal scent which is nice hoping the results meet my expectations

[This review was collected as part of a promotion.] I used this serum consistently but didn’t notice any visible changes in hair growth or thickness. The product was easy to apply and didn’t irritate my scalp, but in terms of results, I didn’t see a difference during the time I used it. It may work better with longer use or for others, but it didn’t do much for me.

[This review was collected as part of a promotion.] I received this product from Influenster in exchange for an honest review. As a guy with thinning hair, I would love to see this just bring back a full head of hair, but I know that's the dream. I do feel like my hair is starting to thicken up a bit on top. Not much is happening around my hairline, but the body is filling out. The product goes on smoothly, works quickly, and doesn't leave a greasy residue like some, and it feels like it moisturizes rather than dries my scalp. The dispenser is cool, it's like an eye dropper with a click button so it's easy to apply the right amount where needed. I'm definitely considering permanently switching to this as my hair loss solution to see what continued use achieves. If you're thinking about addressing thinning hair, give it a shot.

[This review was collected as part of a promotion.] I received the Rule Cosmeceuticals Stem Cell Hair Regrowth Serum thanks to a collaboration between Influenster and the brand, who sent it to me so I could try it and share my honest experience. The scent is light and clean, which makes the application feel refreshing without being overwhelming. The serum has a smooth texture and feels gentle on the scalp—no irritation or discomfort, just a cool, soothing sensation. I paid close attention to the ingredients, and I appreciate the inclusion of stem cell technology and nourishing elements that support hair health. After consistent use, I started to notice subtle improvements in fullness and strength, especially around areas that felt thinner before. The effectiveness builds gradually, and the results feel natural rather than dramatic. I’m glad I had the chance to test it and see how it fits into a long-term hair care routine.

[This review was collected as part of a promotion.] Great packaging, cool design and didn’t have that chemical smell. No irritations or discomfort, used daily and had no issues with this product at all.

[This review was collected as part of a promotion.] The RULE Stem Cell Hair Regrowth Serum is lightweight and not greasy at all. I liked that it absorbs fast and doesn’t make my scalp itchy. Haven’t used it long enough to judge big results, but it feels nice and easy to work into a routine.

[This review was collected as part of a promotion.] Very easy to dispense, just twist and push down. After use my hair felt hydrated and moisturizer all day. The product is quick to absorb. Packaging is well designed.

[This review was collected as part of a promotion.] This bottle of stem cell serum contains 1 fl oz or 30 ml of liquid. The serum is easy to apply to the scalp, and isn’t necessarily sticky. It does take a while to have visible impact on hair growth, and may require purchase of more serum bottles.

[This review was collected as part of a promotion.] Rule cosmeceuticals Stem Cell Hair Regrowth Serum No.4 has been a surprisingly effective addition to my routine. The texture is silky and lightweight, making it easy to spread without feeling greasy or heavy. It causes no irritation even on sensitive areas of my scalp, so I can use it daily with confidence. The serum absorbs quickly and leaving no residue behind. It’s been effective, less shedding, healthier roots and I can see my new hairs growth. This serum is for both women and men experiencing hair loss, thinning hair or shedding. Highly recommended.

[This review was collected as part of a promotion.] I’ve been using this serum and I really like what it’s doing. It has stem cells from Swiss apples, which help wake up hair roots so more hairs can grow. There’s also ginkgo biloba extract that boosts blood flow to the scalp. Plus, it contains castor oil to lock in hydration, vitamin B5 to keep scalp moisturized and a biotin-based ingredient that helps make hair stronger. Since I started using it, my scalp feels much healthier and I’ve noticed less hair falling out, and better hair growth.

[This review was collected as part of a promotion.] I was excited to try this as my hair is beginning to thin at the the top and my scalp is starting to show. I opened this product and it had a slick texture. It felt soothing on my scalp with no irritation or discomfort. I used this every day as instructed. It was easy to apply. I am unable if it is working, but my wife did say my hair looks "fuller" in that area where I have been applying it. So, I guess it is working?! I am excited to see continued improvement as Inuse this longer.

[This review was collected as part of a promotion.] The Rule Cosmeceuticals stem cell hair regrowth serum no4 is a really good product. It actually feels good on the scalp and hair. It does not leave hair oily or greasy. It actually feels like a great leave in conditioner. You actually feel no residue at all once it dries and my hair looks good. It diesnt leave a lingering scent behind. I have experienced no irratation or breakage. I havent noticed a change in hair growth yet but i havent been using long enough yet. It does say that it can be used by men and women which is great because most products are either or. Over all its a really great priduct that will be easy to stick with because my hair loo,s and feels good.

[This review was collected as part of a promotion.] The serum has no scent and doesn’t leave any oily feeling on the scalp. It absorbs quickly and feels light when applied. The packaging looks sleek and high quality too — overall, a pleasant product to use daily.

[This review was collected as part of a promotion.] This serum offers a luxurious, plant-based approach to thinning hair. Its high-quality, non-greasy formula, housed in sleek packaging, is easy to incorporate into any routine—just one dropper full massaged into the scalp each week, making compliance simple. Key to its claims is the inclusion of Swiss apple stem cells and Procapil™, along with nourishing elements like biotin, castor oil, and saw palmetto, which acts as a natural DHT blocker. Initial user feedback consistently praises the serum for feeling lightweight, quickly absorbing without residue, and improving overall scalp health, often noting less inflammation and shedding even in early use. However, as with most growth serums, real efficacy requires patience; dramatic regrowth takes at least three to six months of diligent application. While the natural ingredient profile and pleasant texture are a big plus, the premium price point may require users to trust the initial encouraging signs while waiting for long-term, visible density improvements. This is a promising option for those seeking a minoxidil-free solution.

[This review was collected as part of a promotion.] I’ve been using the Rule Cosmeceuticals Stem Cell Hair Regrowth Serum for a while now, and I’m genuinely impressed. The texture is lightweight and absorbs quickly without leaving any residue. The scent is mild and clean, which I really appreciate for a daily-use product. In terms of effectiveness, I’ve noticed that my hair feels stronger at the roots and looks a bit fuller in the areas I’ve been targeting. It’s not a miracle overnight fix, but the gradual improvement is definitely there. The ingredients list is solid and feels more premium compared to many other serums I’ve tried. The packaging is simple, sturdy, and the dropper makes it easy to apply directly to the scalp without wasting product. For the price, I feel like the value is good considering the quality and results. Overall, a great serum if you’re looking for something gentle yet effective for hair regrowth.

[This review was collected as part of a promotion.] Thank you Rule Cosmeceuticals and Influenster for letting me try the hair growth serum for free. I have been religiously applying it for a couple of weeks now and observing for results. So far it's been barely minimal but I am optimistic. Its ingredients are top grade so confident of its effectivity.

[This review was collected as part of a promotion.] Rule Cosmeceuticals Stem Cell Hair Regrowth Serum offers great value with quality ingredients like biotin, peptides, and stem cell extract. It absorbs quickly, strengthens hair, and promotes growth. Sleek packaging and light texture make this an effective serum.

[This review was collected as part of a promotion.] Well the scent seems very good. The value for the money I like the packaging is very nice. The ingredients seems to be top notch and of high quality and the effectiveness is top tier growing hair and as little as 3 days

[This review was collected as part of a promotion.] Overall, I found this to be a very interesting and fun product to use. The design for the dropper is extremely cool. It draws up the serum as you unscrew the lid. The dropper was easy to use and made application a breeze. I thought the scent was nice and not too strong. I used this for about a month and did feel like I could see new hair growth. My only concern was that the packaging says to "keep away from children and pets" which we have both in our household. I felt safer using this immediately before leaving the house for work, and then taking a shower to wash it off as soon as I got home.