I'm 3/4the way through the bottle, using it only on myself. I can honestly say that not once did I see detectable volume. I won't be buying it again. For reference, my hair strands are "fine", although I have a lot of hair and my length is to my mid back.

[This review was collected as part of a promotion.] OGX Biotin & Collagen Shampoo has been a delightful addition to my hair care routine. The shampoo lathers well and gives my hair a thorough cleanse without stripping it of natural oils. I have not noticed a significant improvement in the volume but with the texture I would say it feels soft after I use it. The subtle fragrance is a pleasant bonus that lingers without being overpowering. While it may not perform miracles, the results make it a reliable choice for me.

[This review was collected as part of a promotion.] This shampoo was really gentle on my hair. I’m transitioning from all the hot tools and letting my hair natural. It’s been quite a journey but I’m shortly but slowly I’m finding the right products for my hair. I enjoyed using this shampoo it didn’t tangle my hair and it did a good job cleaning it.

I have 3c/4a natural hair and I've stopped using shampoo about a year ago. But instead of picking up my cleansing cowash, I used biotin & collagen shampoo this morning. I must say this is by far THE BEST SHAMPOO I've ever used!!!! I only needed a small amount of this to saturate my entire scalp/hair. This shampoo almost worked as a detangler because it did not leave my hair "brittle" and "stiff" while washing. I would recommend

[This review was collected as part of a promotion.] Was really excited to try this shampoo, however the smell is pretty strong and wasn’t my favorite. It’s a great consistency and applied evenly. It got very sudsy and covered my hair well. My hair felt great after just didn’t love how it smelled!

[This review was collected as part of a promotion.] I used this in combination with the conditioner. It leaves my hair shiny & smooth. It has a light coconut scent that is pleasant and not overpowering. I like the way it makes my hair feel, can’t comment on hair growth as I haven’t used it for long enough, but it’s definitely a great value for the price.

[This review was collected as part of a promotion.] OGX Thick & Full Biotin & Collagen Volumizing Shampoo is definitely a product worth trying. As someone with fine and thin hair, I am constantly on the lookout for shampoo products that can give my hair some volume and thickness. The combination of biotin, collagen, and wheat protein seem to strengthen my hair and give it the boost of volume that it needs. I also enjoy the scent this shampoo has. It is a delightful blend of bergamot, jasmine, and vanilla that jeeps my hair smelling fresh for a while after washing. The one complaint I have is that is makes my hair feel dry after I use it. This problem can be solved by using a leave in conditioner! I received this product from Influenster and OGX and exchange for my honest review. 

Worst shampoo ever! So dry, frizzy, rough, tangled my hair became after using it! I regret choosing this horrible shampoo over my all-time favourite shampoos. A lot of people warned me before buying this shampoo, shared their horrible experience. But I didn't listen to them, trusting all these good reviews on their website, now I understand all are fake/paid reviews. Cause this is a trash man! Don't use this if you want to save your hair! Never ever going to buy this! Not going to recommend this to anyone!

I’ve been buying this for the past two years and have never had problems with it. But all of a sudden this last bottle I bought had the consistency of jelly?? It did not even lather or get too soapy in my hair. Was very disappointed given that I love this shampoo. Not sure if it was just the bottle of what. I’m going to exchange it for another and hope for the best.

[This review was collected as part of a promotion.] I’m so impressed! It always feels that all of us with fine hair are forced to choose between texture and volume or the nutrients and care our hair needs; but look no further for the perfect solution to both. I absolutely love the jasmine bergamot and vanilla scent, and that this has none of the bad stuff but rather helps the appearance of my fine thin hair while caring for it too! Great value for quality hair care.