Just thought I'd add this...<p>Creatine is naturally produced in the human body by amino acids. Just because you're a vegetarian, it doesn't mean you suffer a shortage of the particular amino acids required for producing creatine. Most vegetarians fall under the "ovo-lacto" umbrella, meaning they will eat egg and milk, and pretty much anything else made by animals, just not the animals themselves - being a vegetarian myself, I often say: "I'll eat food made by animals, just not food made OF animals" - and many vegetarians also use various "fullworthy" protein supplements containing all the essential amino acids, guaranteeing them all the components needed to produce creatine while being a vegetarian.<p>I myself use protein supplements to ensure, together with food, that I get a bit more than 1 gram of fullworthy protein per kilo body weight a day, and that is an amount that actually even meat-eaters, without supplements, can have a hard time reaching on a daily basis.<p>Addendum:<p>Digging a little bit on Wikipedia, I found the three amino acids (of which only one is essential) that Creatine is produced from in the body:<p>Arginine (non-essential) - vegetabilic sources: "wheat germ and flour, buckwheat, granola, oatmeal, peanuts, nuts (coconut, pecans, cashews, walnuts, almonds, Brazil nuts, hazelnuts, pinenuts), seeds (pumpkin, sesame, sunflower), chick peas, cooked soybeans."<p>Glycine (non-essential) - synthesized in the human body from Serine, also a non-essential amino acid.<p>Methionine (essential) - vegetabilic (and animalic) sources: "High levels of methionine can be found in sesame seeds, Brazil nuts, fish, meats and some other plant seeds; methionine is also found in cereal grains."<p>Judging from this, it seems that a vegetarian has to maintain a really lousy and unhealthy diet in order to suffer a Creatine shortage. Maybe the test subjects were university students on a Ramen diet.