I've been dealing with severe dandruff for over 5 years. Since then, I've found a way to rid myself from this embarrassing condition.
Go to you local supermarket and purchase Distilled(white) vinegar 5% acidity and Selsun Blue listed above. Go to GNC or a comparable supplement store and purchase coconut oil and zinc(chelated is fine).
The Coconut oil and zinc will be you dietary supplement. You must take a tablespoon of coconut oil each morning BEFORE you eat. It is solid below 72 degree F and liquid above that temperature. Take coconut oil with some water to help you swallow. It will may give you the runs at first. This is normal. Take zinc with your first meal.
Vinegar and Selsun Blue will be your topical treatment. Get into the shower and wet your hair. After your scalp is wet, apply a generous amount of vinegar to your scalp and massage it deep in. Scratch it in your head. It will burn at first. Use a good amount. At least 5 tablespoons. Be careful not to get it in your eyes. Keep it on for as long as you shower. Rinse it off when you are done showering. No matter how much you rinse, it will smell. Do this if you are staying home or if you have a day off. You will smell for a few hours, it is unavoidable. Be sure to rinse it off with COLD water. Always rinse off your scalp with cold water from now on.
After you completed step 3, you will notice that your scalp won't itch anymore. You will flake severely for the next few days. This is normal, do not freak out. It will gradually lessen until you don't flake at all.
The next day, you will use Selsun Blue. You will follow step 3 exactly, just replace vinegar with Selsun Blue.
Wait 2 days before you repeat steps 3 and 4.
Gradually, the vinegar will stop burning and your dandruff will decrease dramatically. Continue to take your supplements. The zinc prevents the fungus from growing and the coconut oil will keep your skin and scalp healthy. Eventually, you will not have to repeat any steps. You must follow this guide for at least 2 months. Eventually, you will not need the vinegar.