OK, here is a complete rundown on creatine...
I have extensive experience with Creatine use, both by reseach and personal experience. First, not all creatine products are the same, contrary to what others have said in this thread. The ONLY creatine you should buy is that made by Creapure, a German company. Their creatine is 99% pure. Creatine made by any other manufacturer may be around 85-90% pure, which is, obviously, a huge difference. I don't want to sound like a Creapure spokesperson, but this is the best stuff you can get. You can find this stuff at GNC. Keep in mind that Creapure sells their products to major manufacturers, so if you see creatine supplements at a store, look for the Creapure label, which is usually a small red oval with the word creapure in the center. I've tried different kinds of creatine, and I get the best gains by far from creapure products.
Applejuice and grapefruit juice are NOT citris. Infact, taking creatine with grapefruit juice will help your body absorb the creatine much more efficiently. The sugars in grapefruit juice help with the absorption. Of course, you could just take it with water, which is what I end up doing most of the time because juice isn't always readily available, but it's best to just keep a jugg of grapefruit juice in the fridge just for this purpose.
Loading... ah this is very controversial. One user said that your body maintains the same levels of creatine whether you load or not, which is absolutely TRUE. I personally believe it's best to NOT load, because the majority of that creatine simply passes through as waste. For maintenance, I personally take half the recommended dosage, which ends up being one teaspoon a day. The reason being, is that it is true there have been no long term studies on creatine, and the permanent effects are not known, so I just try to stay on the safe side. At the point I'm at now, I don't notice any difference whether I take the recommended dosage or half of that, so I'm opting for the lower dosage; plus, I don't have to cyle it as frequently. If you're just starting out, I would recommend half of the loading dosage and the full recommended dosage.
Cycling IS important, as your body naturally produces creatine, and if your body becomes acustomed to accepting creatine from another source, it's own production of creatine can and will become hampered. I would recommend, and this is the recommendation of most of the experts who's research I've read, is three months on and one month off.
No hard evidence has been confirmed that shows creatine will cause permanent damage to the liver and kidneys, but it doesn't take a rocket scientist to realize that anything in excess is harmfull. Extended use of creatine will be harmfull. If you don't drink enough water, you'll be in trouble. On that note, drinking enough water is VERY VERY VERY important.
Here's a spoiler...
The reason people look bigger while taking creatine, is NOT because they're gaining muscle mass, but because the creatine is increasing the cell volume in their muscles to allow the intake of more water. If you think you're getting stronger and bigger because your muscles are increasing in mass, you're dead wrong. On that note, it's true that once you stop using creatine, your muscles will decrease in size, because the excess creatine is not in your system anymore to keep your muscle cell volume increased. THIS IS WHY YOU NEED TO DRINK WATER WHILE ON CREATINE!
Creatine does not work for everyone. In fact, about 10% of the people who take creatine show absolutely no gains. If you don't work out like a horse, you won't notice any noticable gains anyway. If you don't take in your bodyweight in grams of protein per day while working out, you won't get the gains you could otherwise. There's more variables to count.
This post is way too long as it is. If anyone wants more info, please PM me.