04/24/2026
Most people look at NSC… But HC is often the number that matters more.
We get this question all the time, and the difference is important.
NSC stands for Non-Structural Carbohydrates.
HC stands for Hydrolyzable Carbohydrates.
Both relate to sugar and starch, but they measure slightly different things.
Here’s where it starts to click:
WSC (Water-Soluble Carbohydrates):
Includes sugars + fructans. Fructans are not absorbed the same way as sugar, but they still contribute to total intake.
ESC (Ethanol-Soluble Carbohydrates):
This is the simple sugar portion only. The part most directly tied to glucose and insulin response.
That’s why many nutritionists look closer at HC:
It focuses on the carbohydrates most likely to impact metabolic horses.
Formulas:
NSC = WSC + Starch
HC = ESC + Starch
For many horses, especially those with metabolic concerns,
keeping HC below ~10% is recommended.
Grazers Nutri-Treats are:
💚 HC & NSC below 10%
💚 Third-party tested
💚 Recognized by ECIR as safe for metabolic horses
When you understand the difference, feeding starts to make a lot more sense.
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