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ORNITHINE ALPHA-KETOGLUTARATE
What does it do? The amino acids ornithine and glutamine are combined to form ornithine alpha-ketoglutarate (OKG). OKG has been shown to improve protein retention, wound repair, and immune function in hospitalized patients partly by increasing levels of anabolic (growth-promoting) hormones such as insulin and growth hormone.1 In a large, well-controlled trial,2 non-hospitalized elderly people benefited from 10 grams per day of OKG as they recovered from various illnesses or surgery, showing improved appetite, weight gain, muscle growth, reduced need for medical care, and improved quality of life. No studies on muscle growth in athletes using OKG have been published.
Where is it found? Although the amino acids that comprise OKG are present in protein foods such as meat and poultry and fish, the OKG compound is found only in supplements.
OKG has been used in connection with the following condition (refer to the individual health concern for complete information):
| Rating | Health Concerns |
|---|---|
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Wound healing |
 Reliable
and relatively consistent scientific data showing a substantial health benefit. Contradictory, insufficient, or preliminary studies
suggesting a health benefit or minimal health benefit. An herb is primarily supported by traditional use, or
the herb or supplement has little scientific support and/or minimal health benefit. |
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How much is usually taken? Optimal levels remain unknown, though 10 grams per day has been used in clinical trials.
Are there any side effects or interactions? No side effects have been reported with the use of OKG.
No clear interactions between OKG and other nutrients have been established.
References:
1. Le Boucher J, Cynober LA. Ornithine alpha-ketoglutarate: the puzzle. Nutrition 1998;14:870–3 [review].
2. Brocker P, Vellas B, Albarede J, et al. A two-centre, randomized, double-blind trial of ornithine oxoglutarate in 194 elderly, ambulatory, convalescent subjects. Age Aging 1994;23:303–6.
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