I am currently taking an e/c stack preworkout for energy purposes since I workout in the mornings and have finished my prohormone cycle. I want to keep my workout intensity up now that I no longer have any prohormones in my system and am currently running novla pct. Is adding l-tyrosine going to negatively affect the e/c stack? I heard that l-tyrosine gives more mental focus so I wanted to add it to the stack if it will not affect me negatively.

Here's David's article on it: http://www.bulknutrition.com/?ingredients_id=7

As a quick snipet from it: "This supplement may increase sensitivity to the effects of CNS stimulants. Caution is advised when taking tyrosine along with stimulants and dosages should be lowered accordingly. "

I only had time to skim over the article quick and couldn't find much about it's interaction with ephedra. It does say that it makes the appetite suppression of ephedra stronger.

Sorry I can't give you dosage numbers. I'm sure sombody else can answer that one for you.

There have been people who can take 5-10 grams of tyrosine alone and it doesn't put a dent in them, but then they take just a few grams with ephedrine and they say it makes it significantly stronger. I would recommend starting with 1 g at most along with EC to see how it affects you.

thanks all for the information