Diet n nutrition are absolutely vital to health. Our bodies are made from minerals. What we eat/take effects how susceptible we are to infection, among other things. You've probably heard for eg that adequate levels of vitamin C will reduce likelihood and severity of viruses(horses produce own vitC so dont worry about them for that one tho). This is but one specific.
Rain rot is but one 'symptom' that can be due to nutritional imbalance, too high carbs, etc. Just like candida is endemic in humans due to high carb diets. If you don't know anything about diet & nutrition, I suggest you start by consulting an equine nutritionist(or vet who's specialised) to work out what your particular horse needs, as its a huge & complex subject to start at square 1 on, when you already have a problem needing treatment. As for online info/service, I reckon feedxl.com is one great source.
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