I have been using those 大隻奶粉 for many years. Very helpful. Don't trust those cheap stuff, because those 600幾 really worth. The composition makes the difference. Check http://www.mensprime.com/burnthefat/protein.html to learn more. Watson's & Manning also have many choices. Brand name is not important, the composition & price is critical.
Also use other natural supplement: such as eat 3-5 eggs a day, and 3-5 banana a day. These are low cost & effective.