I have heard from various sources that you should ideally work out and eat properly for about a year to get in tune with your body with a training regimen in place before taking any supplements. Once you do that, then you can begin adding supplements to the equation.
I have posted a similar question on this board, and I have also posted on other boards seeking the same information. Here is what I have learned thus far:
You can overuse creatine. Take too much and you piss it all away and put excess strain on your body's natural filtration system. I have been told that 5g/day post workout is sufficient, without any need to "load", as some manufacturers suggest. Going up to 7g would be a max level for maintenence.
Creatine should also be "cycled". Meaning, you take it for 6-8 weeks, then stay off of it for 6-8 weeks, and begin again etc. This helps mitigate the effects of water retention and "false muscle growth" due to this retention.
Creatine does not dissolve in water easily, and requires up to a litre (1 quart, or 1/4 gallon) to be fully effective.
L-Glutamine, can be taken more frequently. 5g/day post workout and 5g/day pre-bedtime. I am sure your body can only use a certain amount of it daily, so overuse would be a huge waste of an expensive supplement.
Protein: Rule of thumb, 1-1.5g protein per pound of body weight. ie. 100 pound person should have 100-150g protein over the course of the day. Eat 6 meals and this should be easy, especially if you are supplementing with a protein powder.
It is important to have a meal high in protein and carbs following a workout.
BUT....in order for any of this stuff to be effective, you have to work out and eat lots and eat right. Protein is your friend, and if you are looking to add pounds, so are good carbs. I was told on this board that nothing can replace good honest hard work. Without that, you may as well just mail me your money and forget about it, 'cause this stuff really adds up month to month.
They have cheap supplements, and all the prices are in Canadian dollars....which is like dealing with pesos for you guys.
Hope this helps you out.
If I have misrepresented any of the 'facts' I have given, please, someone step in and correct me so that no one is misguided. Or if you have a different opinion, let this guy have it.
Chris