Now, the financial revenue you can make from a non-patentable amino acid that is commonly found in fish and meat products is obviously limited. Thus, the steadily increasing number of players on the supplement market is continuously trying to “reinvent the wheel”, by putting forward a new, better-absorbed, more effect, side-effect free or whatever else the marketing guys had on their minds forms of N-(aminoiminomethyl)-N-methyl glycine (=chemical formula of creatine). These “superior” forms of creatine are then put forward as the must have for every seriously training athlete and/or creatine non-responders (these are people, where – due to various not fully understood mechanisms – creatine has no measurable effect on performance, (intracellular) water retention and body weight) and usually disappear from the market just about at the same time, the first batch has been sold and disappointed customers begin to vent their anger on the blogs and bulletin boards of the fitness world.
With reference to the purported superiority of novel forms of creatine R. Jäger, one of the leading researchers in the field writes in a recently published paper (Jaeger. 2011), the results of which have previously been presented at the 2010 Creatine in Health and Sports conference:
[…] the efﬁcacy, safety, and regulatory status of most of the newer forms of creatine found in dietary supplements have not been well established. Additionally, there is little to no evidence supporting marketing claims that these newer forms of creatine are more stable, digested faster, and more effective in increasing muscle creatine levels and/or associated with fewer side effects than CM.In their extensive review of the literature Jäger et al. dissect many of the commonly held views on the purported “instability” and “low absorbtion rate” of creatine monohydrate, evaluate the different creatine contents of various supplemental forms and their individual solubility, stability and bioavailability. And while some other forms are in fact more soluble…
Creatine monohydrate dissolves at 14 g/L at 20°C resulting in a neutral pH of 7. A saturated solution of tricreatine citrate in water has a pH of 3.2; whereas a saturated solution of creatine pyruvate even has a pH of 2.6 (pyruvic acid is a stronger acid than citric acid). The decrease in pH results in an increase in solubility: 29 g/L creatine citrate at 20°C, and 54 g/L creatine pyruvate at 20°C. Normalized by the relative amount of creatine per molecule (monohydrate 87.9%, citrate 66%, pyruvate 60%), creatine citrate (19.14 g/L) shows a 1.55-fold and creatine pyruvate (32.4 g/L) a 2.63-fold better solubility when compared with the monohydrate (12.3 g/L).The acidity of your stomach is high enough, anyway, so that even if you just swallow the powder it will eventually dissolve, when it comes in contact with your gastric acid - for monohydrate [CM] Jaeger reports the absorption to be as high as 99%.
Furthermore, pre-solving of creatine in water is counter-indicated, because, as Jaeger et al. write, …
[…] solution precludes the manufacture of shelf-stable standard ingredient. If creatine is not consumed immediately after it has been dissolved in water, it should be stored at a low temperature to retard the degradation.So you better throw away your liquid creatine - chances are its 99% degraded even before you bought it from your retailer.
The instability is even more of concern in the case of Creatine Ethyl Ester (CEE) which has been found to be “actually less stable than CM.” (Child & Tallon. 2007).
CEE is mostly converted into creatinine under physiological conditions encountered during transit through the various tissues, suggesting no ergogenic effect is to be expected from supplementation of CEE.The latter, i.e. creatine ethyl esther, is also less bioavailable,
|Figure 1:Changes in total muscle creatine content in response to placebo (PLA), creatine monohydrate (CRT), and creatine ethyl ester(CEE) supplementation (Spillane et al. 2009, cf, fig. 1).|
Also, while Jaeger et al. report some evidence for the beneficial effects of co-supplementation with glucose, protein or (low dose) D-pinitol, I personally doubt that either of them is necessary to take advantage of the repeatedly proven ergogenic effects you can get from the cheapest, most researches, safest and easiest to obtain form of creatine – creatine monohydrate.
On a side note: My friends @ironmagazine.com have found an interesting study on the effect of creatine + nitrate, which is currently hyped as “the next big thing”. Although, I suppose that the amount of the carcinogen N-nitrososarcosine, which is a byproduct of their reaction, is hardly high enough to trigger cancerous growth, the lack of direct scientific evidence that creatine nitrate has any beneficial effect over the individual use of nitrates (for pump) and creatine (for performance) at least makes me wonder if you could not eat a buckload of beet roots (high in nitrate) with your creatine monohydrate to achieve the same effect ;-)