There's absolutely no question that it does. For me it reduces the brain foginess and makes me a lot more functional. It does take away euphoria for me usually when the THC to CBD ratio is lower than like 4:1 though. It seems to make it last longer sometimes too. I only see value in it medicinally, or if you're having a bad high it's good to have some nearly 0% THC bud on hand with high amounts of CBD to abort the trip. It won't stop effects but your heart will stop racing and you'll calm down hugely.