Mixability 8
  • Contains the powerful ingredient combination agmatine and norvaline for better muscle pumps
  • Only available at GNC and not affordable unless you're a member
8.2Overall Score

One of the most celebrated aspects of weight lifting right now is the venerable pump. Not surprisingly, this has caused supplement manufacturers to inundate the pre-workout category with stimulant-free pump products à la Precursor.

Understandably, trying to keep all these products straight can make you feel like you’re in an insomnia fueled fugue, unable to distinguish one supplement from the next.

So to help you out with navigating these stimulant-free supplement waters, here’s a complete review for the new Precursor from Science Powered Supplements.

Ingredient Analysis

Science Powered Supplements Precursor Pre-workout
I’m a huge advocate of transparent ingredient labels, so my reaction upon seeing a proprietary blend wasn’t exactly favorable. That being said, the advanced pump matrix in Precursor consists almost exclusively of pump-promoting ingredients.

What’s more, agmatine and norvaline are one of the best ingredient combinations if you’re looking for a good pump. Agmatine is an arginine derivative that is absorbed more efficiently, and boosts nitric oxide levels so you get more oxygenated blood flushed into your muscles.[1]

Norvaline works synergistically with agmatine to improve blood flow and foment better pumps by inhibiting the arginase enzyme, an enzyme which degrades arginine and obstructs vasodilation.

The only non-pump ingredient in the advanced pump matrix is beta-alanine, an amino acid that delays muscle fatigue and allows you to get more reps before that burning sensation sets into your muscles, forcing you to stop your set.[2]

As for the SPS energy complex, you’re going to get a natural energy boost through the patented elevATP, and antioxidant support with the grape seed extract. This complex also contains the amino acid tyrosine, which helps with focus and concentration.

My Experience With Precursor

Since this is a stim-free product, I had no problem starting off with 2 scoops. Be advised that you will feel a skin-tingling and “pins and needles” feeling from the beta alanine. This is called paresthesia and is normal, but can make you very uncomfortable. This feeling will subside after a few minutes though.

I had a really solid pump off two scoops, which leads me to suspect this is probably a little overdosed if you’re a veteran supplement user. That being said, the pump lasted my entire workout and I could feel Precursor working just after starting my first set.

Science Powered Supplements Precursor

Precursor Price, Availability, and Flavor

Precursor is ostensibly exclusive to GNC, and there’s a pretty big disparity between the member price and the retail price. If you’re a member, you can grab Precursor for $49.99. Otherwise, it’s a whopping $64.99.

As for the taste, I tried out Precursor’s blackberry flavor and think they did a really good job with it. It’s not overly sweet, and I had no problems drinking it. It also mixed without any problems.

Final Word on Precursor

Personally, Precursor isn’t a product I would take by itself, especially since I’m accustomed to taking higher ingredient dosages.

However, I would definitely recommend it if you’re looking for something to stack with another pre-workout, in order to get higher dosages of ingredients like agmatine and norvaline for bigger pumps.


[1]Morrissey JJ, Klahr S. Agmatine activation of nitric oxide synthase in endothelial cells.
Proc Assoc Am Physicians. 1997 Jan;109(1):51-7.

[2] Artioli GG, Gualano B, Smith A, Stout J, Lancha AH Jr. Role of beta-alanine supplementation on muscle carnosine and exercise performance Med Sci Sports Exerc. 2010 Jun;42(6):1162-73. doi: 10.1249/MSS.0b013e3181c74e38

About The Author

Brian E. is from southern California and has worked for names like GNC and Vitamin Shoppe as a supplement expert and consultant. He currently lives in Utah and is studying marketing.

One Response

  1. wilford c lynn

    im going 2 try this in the morning i did my squats last week i had not worked out all week my first day back after work set of 1x70x10 / 3×110 /3×165/ 3×185 3×205 3×250 3×265 3×275 3×290 workout will lynn i need to try this 4 my morning pump im the master 4 usapl/mi champion 2015 – 16


Leave a Reply

Your email address will not be published.