• Uses the same ingredient dosages used in research studies of Peak ATP and beta-hydroxy beta-methylbutyrate
  • Expensive, and only Clear Muscle can be purchased as a stand-alone product
8.4Overall Score

Despite recently launching their new Essential Series line, MuscleTech still found the time and resources to turn out more grist for the GNC supplement mill.

Like the other products in the SX-7 series, Pro Clinical Muscle Stack SX-7 is also a GNC exclusive and features two compounds getting a lot of attention right now.

The two products teaming up together in here are Peak SX-7 and Clear Muscle SX-7, and have some serious synergistic potential. Like Battle Toads teaming up with Double Dragon potential.
Here’s everything you need to know.

Two Turnt Up Products

Pro Clinical Muscle Stack SX-7 includes MuscleTech’s new product Clear Muscle, as well as Peak SX-7, a product ostensibly created just for the Pro Clinical Muscle Stack.
MuscleTech SX-7 Pro Clinical Muscle Stack Reviews
If you’re not familiar with Clear Muscle, it consists of the ingredient beta-hydroxy beta-methylbutyrate, or HMB for short. This compound is a leucine metabolite which helps stimulate the vaunted mTOR pathway.

A big deal is made about mTOR because it’s the body’s main muscle building gene. Put simply, by stimulating greater mTOR activation you get better protein synthesis and muscle growth.

What’s more, each serving gives you an efficacious 1 g dose of the ingredient beta-hydroxy beta-methylbutyrate. A study showing beta-hydroxy beta-methylbutyrate increased muscle mass, muscle strength and anaerobic properties, also used a 1 g dosage.[1]

Packing It On With Peak ATP

Peak SX-7 combines the compound Peak ATP and the ingredient eurycoma longifolia. If you’re not familiar with ATP, it stands for adenosine triphosphate, and functions as the source of energy for the body’s cells.

Peak ATP basically provides extracellular ATP, which is shown to increase nitric oxide production and boost muscle pumps. It also boosts strength and power by enhancing muscle contraction and improves anabolic signaling by stimulating better protein synthesis.[2]

You also get 400 mg of Peak ATP per serving, which is the same amount Peak ATP’s manufacturer recommends taking.

Additionally, research shows the ingredient eurycoma longifolia can boost serum testosterone concentration and help treat males with hypogonadism.[3]

What I Noticed Taking Pro Clinical Muscle Stack

After a month of taking this stack I was up about 3 pounds of muscle with the same amount of body fat. I’ve lifted for over 10 years so this was a pretty big gain for me.

There’s no denying this dents the wallet, and might take up your entire supplement budget. But if you’re training for a show, feel like your gains have stagnated, or just in a hurry to maximize muscle gains for a vacation, I would definitely recommend this.
MuscleTech SX7 Pro Clinical Muscle Stack

Price and Availability

Pro Clinical Muscle Stack SX-7 contains a full month supply, and is only available at GNC. The total price of the stack is $159.99 for non-members, and $127.99 for members.

Even at the member price you’re looking at a little over $60 per product, and as of right now you have to buy them together (Peak SX-7 isn’t available as a stand-alone product).

However, this does appear to save you a few bucks on the Clear Muscle. The price for Clear Muscle by itself is around $69.99.

Pro Clinical Muscle Stack Summarized

If you have the money, you’re getting two well-researched and effectively dosed products. Pro Clinical Muscle Stack is a great way to either maximize muscle growth for a show, or just accelerate a goal you’ve set for gaining muscle.

[1] Portal S, Zadik Z, Rabinowitz J, Pilz-Burstein R, et. al., The effect of HMB supplementation on body composition, fitness, hormonal and inflammatory mediators in elite adolescent volleyball players: a prospective randomized, double-blind, placebo-controlled study Eur J Appl Physiol. 2011 Sep;111(9):2261-9. doi: 10.1007/s00421-011-1855-x. Epub 2011 Feb 16.
[2] Kichenin K et al. Cardiovascular and pulmonary response to oral administration of ATP in rabbits. J. Appl. Physiol. 2000; 88:1962-1968.
[3] Tambi MI, Imran MK, Henkel RR. Standardised water-soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late-onset hypogonadism? Andrologia. 2012 May;44 Suppl 1:226-30. doi: 10.1111/j.1439-0272.2011.01168.x. Epub 2011 Jun 15.

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.

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