Trail and Ultra Running Fuel

Fuel for trail races, 50K and beyond, picked from our 50K trail and 8-hour How to Fuel guides. On long days in the mountains the aim is steady energy you can keep down for hours: complex carbohydrates rather than simple sugars, a little protein on the longest efforts, and electrolytes every hour. A flask and a capsule dispenser make it easy to carry.

Read the full plan first: 50K trail run guide and 8-hour fueling protocol.

Trail runner in the mountains
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