Optimal ECA Stack Dosages for Fat Loss

ec fat burner stack

The EC or ECA stack is a combination of ephedrine, caffeine, and optionally aspirin. Aspirin has shown to be fairly ineffective in it’s part of the ECA stack and ‘does not potentiate the thermogenic response to ephedrine’1, so it’s not necessary for this stack. Prolonged daily aspirin use may also increase the chance of a heart attack, so it’s best to just stick to the EC (ephedrine and caffeine) stack.

The optimal dosage of EC stack has been shown to be 20 mg of ephedrine and 200 mg of caffeine 3 times per day, which ‘produced the strongest thermogenic response’2.

Week 1

Day 1

Dose Caffeine Ephedrine
Test Dose 8mg Ephedrine 100 mg caffeine
Day 2-3

3 doses 4-6 hours apart
Dose Caffeine Ephedrine
1 8mg Ephedrine 100 mg caffeine
2 8mg Ephedrine 100 mg caffeine
3 8mg Ephedrine 100 mg caffeine
Day 4-7

3 doses 4-6 hours apart
Dose Caffeine Ephedrine
1 16mg Ephedrine 100 mg caffeine
2 16mg Ephedrine 100 mg caffeine
3 8mg Ephedrine 100 mg caffeine

Week 2

3 doses 4-6 hours apart
Dose Caffeine Ephedrine
1 24 mg Ephedrine 200 mg caffeine
2 16 mg Ephedrine 200 mg caffeine
3 16 mg Ephedrine 100 mg caffeine

Week 3-10

3 doses 4-6 hours apart
Dose Caffeine Ephedrine
1 24 mg Ephedrine 200 mg caffeine
2 24 mg Ephedrine 200 mg caffeine
3 16 mg Ephedrine 200 mg caffeine

Notes:
Those with access to 25 mg ephedrine pills can cut them in half as necessary (for 2 12.5 mg halves). These can be substituted for the 8mg and 16mg dosages, and 1 full 25mg pill as a substitute for the 24 mg dosages.

Caffeine pills can also be cut in half if needed for the 100 mg dosages, or you can substitute caffeine pills completely with coffee. A 12-18 oz cup of coffee contains roughly 200 mg of caffeine.

It’s one of the more effective and cheaper fat burners on the market, but if you rather have a simpler alternative you can check out our list of other fat burning supplements here.

Resources:
1: Horton TJ, Geissler CA. Aspirin Potentiates the Effect of Ephedrine on the Thermogenic Response to a Meal in Obese but not Lean Women. Int J Obes, 1991 May;15(5):359-366.
2: http://www.ncbi.nlm.nih.gov/pubmed/8384179

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