I'm not taking any supplements besides creatine and I'm growing at a very good rate, just eat lots of complex carbs, clean proteins and good fats and you shouldn't need anything else, weight gainers are a waste of money, they have way too much suggar.
Make sure you divide your calorie intake between at least 5 meals and concentrate your carbs on the pre and post workout meals.
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Make sure you're working your muscles and not overtraining. You can take tons of suplements, but if you're not working your body right, you won't see any results.