GAA:
Creatine's Direct Precursor
Guanidinoacetic acid (GAA) is the compound your own body converts into creatine. Here's the mechanism, the clinical dosing, the homocysteine question, and how CreGAAtine — Unmatched's creatine + GAA formula — uses it.
What Is GAA?
Guanidinoacetic acid (GAA) is a naturally occurring compound your kidneys and liver use as the direct precursor to creatine — the last biochemical step before creatine itself. Your body makes a small amount on its own from the amino acids arginine and glycine, then converts it into creatine using an enzyme called GAMT (guanidinoacetate N-methyltransferase). Supplementing GAA directly gives your body more raw material to synthesize its own creatine, which is why it's paired with, not sold as a replacement for, creatine monohydrate.
CreGAAtine® is Unmatched's name for its specific creatine monohydrate + GAA blend. Unlike free creatine, GAA is also able to cross the blood-brain barrier more readily, which is the basis for research into its effects on brain creatine content and cognitive performance, not just muscle.
What the Research Shows
Raises Muscle Creatine
Dose-response research shows single oral GAA doses produce a dose-dependent rise in plasma creatine — a marker of increased creatine synthesis.
Crosses the Blood-Brain Barrier
A pilot trial found GAA supplementation raised both muscle and brain creatine content, positioning it as an option for the cognitive as well as muscular side of creatine's effects.
Improves Muscular Performance
A six-week trial in healthy volunteers found oral GAA supplementation improved muscular performance measures versus baseline.
Complements, Doesn't Replace, Creatine
Because GAA works by boosting your body's own creatine synthesis, it's formulated alongside creatine monohydrate rather than instead of it — the approach CreGAAtine takes.
Clinical Dosing
Published research has tested single GAA doses from 1.2g to 4.8g, and repeated daily dosing around 2-3g for several weeks at a time. CreGAAtine delivers a 2,000mg blend of creatine monohydrate and GAA per scoop, with directions calling for one scoop twice per day — before and after training on training days. The same 2,000mg CreGAAtine blend is also built directly into BH2K pre-workout, which is why Unmatched's own directions suggest taking standalone CreGAAtine post-workout rather than doubling up if BH2K is already your pre-workout.
The Homocysteine Question — and Why B-Vitamins Are on the Label
GAA's one well-documented downside: the same GAMT enzyme reaction that converts GAA into creatine also consumes a methyl group, which can raise homocysteine — a metabolic byproduct linked to cardiovascular risk at chronically elevated levels — during supplementation. Dose-response research has shown this effect, and identified vitamin B6, folate, and vitamin B12 as the nutrients that help keep homocysteine from climbing during GAA use.
That's a direct explanation for CreGAAtine's label: alongside the creatine-GAA blend, every scoop includes vitamin B6, folate (as L-5-MTHF), and vitamin B12 — not filler, but the specific nutrients the homocysteine research points to. A more recent multi-week safety trial combining high-dose creatine monohydrate with GAA found no adverse effect on homocysteine or standard blood markers in healthy adults, consistent with a formula that manages the one real risk factor rather than ignoring it.
The Studies
Ostojic & Vojvodic-Ostojic, 2015 — Nutrition Research: Single oral GAA doses of 1.2g, 2.4g, and 4.8g produced a dose-dependent rise in plasma creatine, confirming GAA is converted into creatine in a dose-responsive way.
Ostojic, Stojanovic, Drid & Hoffman, 2014 — European Journal of Nutrition: Established the dose-response relationship between oral GAA, serum creatine, and homocysteine — the basis for pairing GAA with B6, folate, and B12.
Ostojic, Stojanovic & Hoffman, 2015 — American Journal of Physical Medicine & Rehabilitation: Six weeks of oral GAA administration improved muscular performance measures in healthy volunteers.
GAA research is a smaller, more specialized literature than creatine monohydrate's — the compound has decades less study behind it. The direction of the findings is consistent across the trials above, but as with any newer ingredient, more independent replication is the honest next step rather than treating early results as settled.
Frequently Asked Questions
What is GAA (guanidinoacetic acid)?
GAA is the direct metabolic precursor your body converts into creatine. Supplementing it gives your body the raw material to synthesize its own creatine, alongside whatever creatine you're already taking.
How much GAA should I take?
Published research has used single doses from 1.2g up to 4.8g, and repeated dosing of roughly 2-3g per day for several weeks. Unmatched's CreGAAtine blend delivers 2,000mg of combined creatine monohydrate and GAA per scoop, taken twice daily.
Does GAA raise homocysteine?
GAA supplementation can raise homocysteine, a metabolic byproduct, in some individuals — which is why CreGAAtine's formula includes vitamin B6, folate, and vitamin B12, the three nutrients research shows help keep homocysteine in a normal range during GAA use.
Is GAA the same as creatine?
No — GAA is one step upstream. Your liver and kidneys convert GAA into creatine using an enzyme called GAMT. Taking GAA raises your body's own creatine production rather than supplying pre-formed creatine directly, which is why CreGAAtine pairs it with creatine monohydrate rather than replacing it.
Which Unmatched product has GAA, and at what dose?
CreGAAtine (creatine monohydrate + GAA) is sold as its own product and is also the 2,000mg creatine/GAA blend built into BH2K pre-workout. If you're already taking BH2K, Unmatched's own directions suggest saving a standalone CreGAAtine scoop for post-workout rather than doubling up pre-workout.
Try Creatine + GAA in CreGAAtine
2,000mg of creatine monohydrate and GAA per scoop, plus the B6, folate, and B12 the homocysteine research calls for.
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