Formula: I like that the product contains no formaldehyde -- that's just gross -- and it's an inexpensive treatment. You apply it to clean nails then re-apply every day on top of the first layer until the week is over. Then you remove it and start again until your nails build strength. You can use this under and over your regular nail polish as well. I found that it actually hardens the nails but also builds a stronger layer without the peeling. Most nail products I use to strengthen my nails end up doing more damage because they get too hard, chip, peel and break. I didn't find any major peeling here. Like I said it's not a miracle but pretty decent for the price and it keeps your nails healthy.