My Current Pre-Workout: Theanine and Caffeine in a 2:1 ratio.

I am currently taking this pre-workout. It gives me all the energy and focus I need. The energy is jitter free thanks to the theanine.

Theanine and caffeine in a 2:1 ratio. 

Theanine 600 mg 

Caffeine 300 mg 

Sources:

1. http://www.drugbank.ca/drugs/DB00201#pharmacology
2. http://www.ncbi.nlm.nih.gov/pubmed/9889511
3. http://www.ncbi.nlm.nih.gov/pubmed/8081318
4. http://www.ncbi.nlm.nih.gov/pubmed/22142020
5. http://jap.physiology.org/content/93/4/1227.full
6. http://www.ncbi.nlm.nih.gov/pubmed/8061728
7. http://jap.physiology.org/content/93/4/1227.full
8. https://www.ncbi.nlm.nih.gov/pubmed/17182482
9. https://www.ncbi.nlm.nih.gov/pubmed/16930802
10. http://espace.library.uq.edu.au/view/UQ:284103
11. http://www.koreamed.org/SearchBasic.php?RID=0124KJN/2003.36.9.918&DT=1
12. http://www.sciencedirect.com/science/article/pii/S0924224499000448
13. http://www.ncbi.nlm.nih.gov/pubmed/23458739
14. http://www.ncbi.nlm.nih.gov/pubmed/16930802
15. http://www.ncbi.nlm.nih.gov/pubmed/18063498
16. http://www.ncbi.nlm.nih.gov/pubmed/11304755
17. http://www.ncbi.nlm.nih.gov/pubmed/21303262
18. http://www.ncbi.nlm.nih.gov/pubmed/18006208