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Source Naturals, OKG (Ornithine Alpha-Ketoglutarate) Powder, 4 oz (113.4 g)

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In Stock
  • Expiration Date: May 2020
  • Shipping Weight: 0.41 lbs (0.19 kg)
  • Product Code: SNS-00255
  • UPC Code: 021078002550
  • Package Quantity: 4 oz (113.4 g)
  • Dimensions: 2.4 x 2.4 x 4.4 in, 0.35 lbs (0.16 kg)
Product Overview


  • Athletic Series
  • Dietary Supplement

Ornithine alpha-ketoglutarate, or OKG, is a combination of the amino acid ornithine and alpha-ketoglutaric acid (AKG). AKG is an important component in the Krebs cycle, the chief energy-producing cycle in the body. Free-form ornithine is used by athletes and those who want to improve performance. OKG spares muscles the need to break down their BCAA's (branch chain amino acids) in order to generate glutamine, an important energy fuel. Glutamine is generated when AKG combines with ammonia released during intense muscle activity.

Suggested Use

1 teaspoon daily, mixed with water or juice.

Other Ingredients

Suitable for vegetarians and Hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy, or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.


Note: If you are pregnant, may become pregnant or breastfeeding, consult your health care professional before using this product.

Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children.

Supplement Facts
Serving Size: 1 Teaspoon (approx. 3.5 g)
Servings Per Container: 32
  Amount Per Serving %DV
Calories 15  
Total Carbohydrates 2 g 1%*
alpha-Ketoglutaric acid (as ornithine alpha-ketoglutarate [OKG]) 1.8 g
L-Ornithine (as ornithine alpha-ketoglutarate [OKG]) 1.2 g
* Percent Daily Values (%DV) are based on a 2,000 calorie diet.
† Daily Value not established.
iHerb Customer Reviews

I'm really struggling to fight fatigue.

Posted by Reviewer2030227 on Apr 03, 2015

I do not care at all for the taste, very very tart, but seems to help a little. Will stick with and hope for more, but right now a little is good!

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Product arrived spoiled

Posted by Health-Is-Wealth on Oct 19, 2013

Purchased and opened April this year, expiry Oct next year. While the container arrived with seal in place, when I removed the lid and inner seal I found the powder was a solid yellow rock inside. I was able to chip away at it a little to get a taste in some water. It's tart/sour though I like that kind of flavour. What little I was able to mix seemed to dissolve well. Shame - I really wanted to try this. Won't purchase again - too costly. If this review was helpful to you, please click YES below - thank you. For reviews of all the products I have purchased from iHerb, please click my username above.

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Posted by Reviewer1891748 on Jul 05, 2011

Excellent! Been looking everywhere for this! Necessary part of the Krebs cycle and no one seems to have it available!

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Posted by Reviewer1053322 on May 05, 2008

I think this is a great product, have been using it on and off for years. I think this is a multi-faceted product, I find it helps both during workouts and also helping recovery afterwards as well as help reduce joint pain when taken long term.

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A great product, albeit an expensive one

Posted by Reviewer1201926 on Apr 19, 2008

This product is somewhat expensive; however it is of good quality and it is very difficult to find OKG online. I'm on a high protein diet and it is an excellent ammonia scavenger. I feel the difference on the days I take it, more energetic. A clinical trial showed that high doses of OKG (10g/day) improved 1RM performance in trained athletes

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