You know a vitamin is working when something unexpected starts to happen, and the only change you’ve made is adding that supplement to your diet. I started taking these because of a general sense of lethargy - I’ve always had decent enough nails and I take collagen, so I wasn’t necessarily looking for nail growth. Well low and behold, my nails are now insanely strong and healthy. I feel like I’m cutting them a lot more regularly, and they feel so durable - no more breakage! They look so healthy that I don’t feel the need to wear polish - I love how they look! The only thing that changed was adding this to my diet - thanks Windsor botanicals!