To fix cracked heels permanently, you need to put in a bit of work and it will take some effort. There is also a high possibility that cracked heels can be an ongoing problem that may require regular maintenance to keep it under control, especially in the summer months. Firstly, make sure you have a good understanding of the causes of cracked heels as that will go a long way to help you understand what needs to be done to get rid of them.
There is no medicine or vitamins that you can take that will get rid of cracked heels. They are not due to a vitamin deficiency or a deficiency of anything else in the diet. There is no magic cream that you can apply to them that will make then go away. Cracked heels are a mechanical problem, not a deficiency problem.
The first step to getting rid of cracked heels permanently is to get rid of the thickened callus skin that cracks when it is dry. Those cracks in the dry hard skin will never heal up and continue to pull on the good skin below. This could be done by a competent podiatrist or you could do it yourself with a foot file or some other similar tools. Once this is reduced, you need to set up a regular maintenance program to keep the hard skin down. It is much easier to keep it reduced than remove it once it has built up too thick. Maybe see a podiatrist to get it down the first time and then for regular maintenance use a foot file at home yourself after that.
The next step is to use an emollient or cream to soften the skin and make it soft and more supple. Urea based creams (eg Walkers) are particularly effective at this. This really does need to be applied on a daily basis if you want to be serious about fixing cracked heels permanently. You may even want to put some of the cream into something like the silicon gel heel protector and wear that overnight to really let the cream soak in to make a difference.
You can permanently fix cracked heels if you are serious about it and are prepared to put in the effort to care for them yourself. Don’t fall for the magical and mythical miracle cures.