I was allowed to test the BIO-H-TIN nail serum on the basis that I already have strong nails and do not use any nail polish or other nail care products. Although my nails are very strong, they chip here and there at the corners and I have slight ridges. In any case, none of my nails broke during the four weeks of testing, which can otherwise happen. I even had to shorten them at some point because they were constantly getting in the way and I was no longer able to do everyday things like use a keyboard properly. That was really wild

I have been using this nail serum for 4 weeks now and I am delighted! My otherwise brittle nails have become more resistant and no longer break so quickly. They grow faster and look healthier overall. The nail surface looks smoother. I am very satisfied and can recommend the serum without reservation!

I could already see a positive change after just 10 days. My nails were much more stable. After 4 weeks of using the serum once a day in the evening, I am convinced. The serum has really strengthened my nails quickly and noticeably. I have never had such "long" nails (they are now long by my standards), let alone been able to enjoy this length over a longer period of time. My nails always broke, splintered or tore immediately. And in the last few weeks, there really have been a few situations where I thought "That's it for this nail". Purely out of habit. But: my nails are now really much more resistant and I've even had to shorten them a little.

I have now been testing the nail serum for 4 weeks. My fingernails have become stronger overall and they no longer tear so quickly. The nail serum is really easy to apply, like a clear varnish. The odour disappears very quickly and is not unpleasant. My fingernails also have a beautiful natural shine.

I could already see a positive change after just 10 days. My nails were much more stable. After 4 weeks of using the serum once a day in the evening, I am convinced. The serum has really strengthened my nails quickly and noticeably. I have never had such "long" nails (they are now long by my standards), let alone been able to enjoy this length over a longer period of time. My nails always broke, splintered or tore immediately. And in the last few weeks, there really have been a few situations where I thought "That's it for this nail". Purely out of habit. But: my nails are now really much more resistant and I've even had to shorten them a little.

I have been using the BIO-H-TIN nail serum with bamboo extract and biotin for some time now. I have tried to apply it as often as possible in the evening as it promises stronger and healthier nails after 4 weeks of regular use.

The nail serum was provided to me free of charge. It's very easy to use, just brush it on your nails before going to bed, leave to dry briefly and you're done. It is absorbed without leaving any residue. I have tested it for 4 weeks and it has improved the appearance of my nails - no more breaking and splitting.

I have been using the serum for 4 weeks now. My nails have become much harder, they no longer break and simply look much better cared for.

I have been using this product every day before going to bed for 4 weeks now. It is very easy to use, just apply to the nails with a brush and leave to dry briefly. The product leaves no unpleasant residue and is transparent. After 4 weeks, my fingernails feel much stronger and healthier. With my current nail length, 2-3 nails have always broken or torn over the last few months, but this hasn't happened this time thanks to the nail serum. It's a great product and you can see very good results after just one month.

I've had a lot of trouble with my nails recently - breaking, splitting, ridges. I tried the Bio-H-Thin nail serum and it helped me, not immediately, but after the 2nd week my nails were no longer so brittle and the nail surface was much smoother. Now, after about 4 weeks of applying it every evening, I am fully convinced that I can show off my beautiful nails again.