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This study conducted a secondary analysis of previously completed guanidinoacetic acid (GAA) loading trials categorizing participants into responders and non-responders using cut-off points for an increase in the location-specific levels of brain creatine (e.g. thalamus, cerebellum, white and grey matter). A total of 19 healthy men (mean age = 24.8 years) who were supplemented with […]

Co-administration of creatine and guanidinoacetic acid (GAA) has been recently put forward as an advanced dietary strategy to optimize tissue bioenergetics. We hypothesized that creatine-GAA mixture would result in a more powerful rise in brain and skeletal muscle creatine, as compared to creatine supplementation alone. A randomized, double-blinded, crossover superiority trial has been performed at […]

We conducted a secondary analysis of a previously completed trial to determine the effects of 8-week guanidinoacetic acid (GAA) loading on brain GAA levels in five healthy men. Brain magnetic resonance spectroscopy (1H-MRS) was taken at baseline and post-administration, with spectra additionally analyzed for brain GAA and glutamate concentrations using TARQUIN 4.3.10 software. Brain GAA […]

Guanidinoacetic acid (GAA) is an experimental dietary additive and has been reported to induce methyl depletion when provided by the diet. However, no study evaluated whether supplemental GAA affects DNA methylation, a critical epigenetic process for genome regulation. In this open-label, repeated-measure interventional trial, we evaluated the impact of 12 weeks of GAA supplementation on […]

We analyzed data from previously completed trials to determine the effects of supplemental guanidinoacetic acid (GAA) on markers of muscle bioenergetics in healthy men using 1.5 T magnetic resonance spectroscopy. No detectable GAA (<0.1 μmol/L) was found in the vastus medialis muscle at baseline nor at follow-up. This implies deficient GAA availability in the human […]

In this open-label trial, we examined the effects of the 10-week supplementation with 3 grams per day of GAA on biomarkers of cardiometabolic risk and inflammation in 20 apparently healthy volunteers (10 men and 10 women; age 22.0 ± 2.3 years). GAA had no significant effects on serum hsCRP, HDL cholesterol, insulin, and triglycerides. Clinical […]

Guanidinoacetic acid (GAA) is an experimental dietary additive that might act as a creatine source in tissues with high-energy requirements. In this case study, we evaluated brain levels of creatine in white matter, gray matter, cerebellum, and thalamus during 8 wk oral GAA administration in five healthy men and monitored the prevalence and severity of […]

Guanidinoacetic acid (GAA; also known as glycocyamine,betacyamine, or guanidinoacetate) is an experimental dietaryadditive that enhances serum creatine bioavailability and affectsblood-derived metabolic markers of methylation in humans. Because creatine is an important compound in cellular bioener-getics, consumption of GAA has been recognized as an effec-tive investigational intervention to facilitate creatine-mediatedenergy provision in health and disease. At […]

In this randomized, double-blind, crossover trial, we evaluated whether 4-week supplementation with guanidinoacetic acid (GAA) is superior to creatine in facilitating creatine levels in healthy men (n = 5). GAA (3.0 g/day) resulted in a more powerful rise (up to 16.2%) in tissue creatine levels in vastus medialis muscle, middle-cerebellar peduncle, and paracentral grey matter, […]

A variety of dietary interventions has been used in the management of chronic fatigue syndrome (CFS), yet no therapeutic modality has demonstrated conclusive positive results in terms of effectiveness. The main aim of this study was to evaluate the effects of orally administered guanidinoacetic acid (GAA) on multidimensional fatigue inventory (MFI), musculoskeletal soreness, health-related quality […]