Yes. But they are not magic beans. They are precisely what they suggest they are, supplements. Sort your diet (or nutritional programme as I call it to save confusion) out and use them to aid. There's plenty of advice. Check out LDNMuscle, I'm sure they have a good run down of advice on what to look for.

For me;
USN myofusion as a post exercise/early morning breakfast shake(mixed with oats, fruit, peanut butter, an egg and coconut oil. Perfect at 530 am before a 630 weights session).
ON Casein at night.

Everything else is supported through strict control of my food intake.

Day 20 on the wagon.

think layer of vaseline on the feet, does the trick just as good

in fact so good you dont even have to put the trainers on