You should take protein and creatine as your key supplements or a Weight Gainer product if you want to gain maximum mass. Take a whey protein shake 2 to 3 times per day with one serving being just before your Halo immediately after training and take creatine monohydrate powder or a creatine tablet (like Creakic or Creadex). Start off taking 4 servings per day for the first 5 days and thereafter take 1 to 2 servings per day (2 on training days and 1 on non-training days). To gain mass at the fastest rate, you can either do the Nitro/Cell stack (Nitro 3 times per day and Cell-Tech twice on training days and once on non-training days - always take one serving of Nitro immediately, followed by Cell-Tech right after training) OR you can use a weight gainer like Mutant Mass (along with powdered creatine) or Mass-Tech or Muscle Fuel Anabolic (which already contain creatine). If your diet is good (high in calories and protein), go with the Nitro/Cell stack, if your diet isn't so good, go with one of the mass gainers - start off with 2 to 3 scoops twice daily and increase until you are gaining the desired amount of weight per week (1/2 to 2 kilos).
A study in the Journal of Strength and Conditioning Research revealed, “WPC ( ± to ± ), Beef ( ± to ± ) and Chx ( ± to ± ) each led to a significant increase in lean body mass compared with baseline (p<) while the control condition did not ( ± to ± ). Fat loss was also significantly decreased at 8 weeks compared to baseline for all protein sources (WPC: ± to ± ; Beef: ± to ± ; Chx: ± to ± ), but not the control condition ( ± to ± ) (p<). One repetition maximum for both deadlift and bench-press were significantly increased for all treatment groups when compared to baseline. No differences in strength were noted between conditions. Overall, the results of this study demonstrate that consuming quality sources of protein from meat or WPC lead to significant benefits in body composition compared to control.” The study looked at the effects of beef, chicken, or whey protein post-workout on body composition and muscle performance. The study was based on 46g of protein a day, meaning one serving of this shake covers half the daily requirements.