Neem oil has its own advantages and disadvantages. If used, it should be in diluted form. Use once in 2 months. If your pet experiences any sort of reaction or discomfort, you should discontinue it.
In addition to that, you can use syrups containing Omega fatty acids.
Neem oil is used for controlling external parasites,it doesn't specifically help to reduce shedding. Giving omega fatty acids orally will help, you can add fish oil and vegetables oils in his diet.