VMI Sports A-XR PCT: An Evidence-Based Review

A-XR PCT is a Post Cycle Therapy Supplement by VMI Sports—the brand behind K-XR Pre-Workout—which contains several natural ingredients as well as a potent Aromatase Inhibitor, Arimistane…




VMI Sports claims that A-XR PCT is designed for “athlete use only” and will:

These are basically the same claims attached to mot PCT Supplements, so let’s take a look at the ingredients and see what A-XR PCT has to offer that other competing products don’t…

A-XR PCT Ingredients

The ingredient profile of A-XR PCT is unique in that it contains everything from basic minerals to herbal extracts and a synthetic AI…

Vitamin D

Vitamin D status (whether you’re deficient or not) is correlated with Testosterone levels, so naturally, Vitamin D supplementation has been studied as a potential Testoterone-booster.

Unfortunately, while Vitamin D deficiency can certainly be characterized by low Testosterone levels, research indicates that excess Vitamin D supplementation does not increase Testosterone levels.

Still, it makes sense to include Vitamin D in any formula that is designed to restore Tesstosterone to optimal, healthy levels because an adequate intake is certainly required for optimal Testosterone production.  So, in the context of A-XR PCT, Vitamin D is actually a useful ingredient.  Not a major ingredient, but useful nonetheless.


Zinc is required for the production of Testosterone.  As with Vitamin D, Zinc deficiency can be characterized by low Testosterone levels so it has been investigated as a potential Test-Booster.

We discuss the relationship between Zinc and Testosterone (it’s pretty interesting) in our article: Can Zinc Increase Testosterone?, but to make a long story a little shorter…

The research is pretty clear that taking in excessive amounts of Zinc won’t boost Testosterone levels beyond the healthy, normal range.  It is, however, a useful treatment option for low Testosterone and has been shown to preserve Testosterone levels in athletes.  This makes it useful in the context of a PCT supplement such as A-XR PCT.

Trbulus Alatus

Tribulus Alatus, not to be confused with Tribulus Terristris, is an herbal aphrodisiac which has been clinically investigated for potential Testosterone-boosting properties.  In male rats, it has been shown to increase serum Testosterone levels, but human studies are non-existent.

Still, even with the lone rat study, Tribulus Alatus has a better track record than Tribulus Terrestris for increasing Testosterone, so that’s the form we’d ideally like to see in Testosterone boosters.

Whether it’s super effective in the context of A-XR PCT remains unclear, but it shouldn’t hurt either.


PrimaVie is a highly standardized form of Shilajit extract which, unlike most herbal extracts alleged to boost Testosterone, has actually been shown to increase Testosterone levels in healthy adult males.

It should be noted, of course, that adult males (we’re talking 45-50 years old) generally have low Testosterone levels, relative to younger males.  For that reason, it’s not quite clear how PrimaVie would impact young, healthy males.

However, in the context of A-XR PCT, PrimaVie makes sense because if you’re coming off any kind of cycle which resulted in your natural Test-production being suppressed, you’re basically in the same boat as older males who have naturally declining test levels.

Saw Pamleto

Saw Palmeto has developed a reputation as an alternative treatment for Benign Prostatic Hyperplasia (BPH), caused by excesssive Dihydrotestosterone (DHT).  It is widely used in Europe as a treatment for BPH and is believed to work by inhibiting the activity of the enzyme, 5α-reductase.  This is the enzyme responsible for converting Testosterone into DHT, so blocking its action reduce DHT and should also reduce DHT-related issues (like BPH and hairloss).

Stinging Nettle

Stinging Nettle (Urtica dioica), like Saw Palmeto, has been investigated as a potential treatment for BPH, with research indicating it may be useful.

The mechanism by which it works is not entirely understood, but one study found that certain bioactives within Stinging Nettle were capable of “modulate the binding of Sex Hormone-Binding Globulin (SHBG) to its receptor on human prostatic membranes”.

SHBG is a protein that binds to the primary sex hormones (Estrogen and Testosterone), so reducing the activity of SHBG may very well increae free Testosterone levels.  Unfortunately, because SHBG binds to both sex hormones, this may also result in excess Estrogen.

So, as a prostate-protectant, Stinging Nettle is worth it, but it’s true impact on Testosterone/Estrogen remains unclear.

Arimistane (Androst-3, 5-dien-7, 17-one)

Arimistane, the primary active ingredient in VMI Sports Arimistane, is a powerful Suicide Aromatase Inhibitor (AI) which is often compared to the prescription AI, Aromasin because of it’s ability to premanently bind to the Aromatase enzyme, rendering it incapable of converting Testosterone to Estrogen.

A powerful AI, such as Arimistane, is a huge piece of the puzzle when it comes to running a successful Post Cycle Therapy protocol.  Without this ingreident, The A-XR PCT formula would not be particularly impressive.  With it, however, A-XR PCT is quite effective.  That’s just how powerful Arimistane is.

Androstenolone (DHEA)

DHEA is a precursor to Testosterone which tends to decrease with age.  For that reason, it is commonly used as a treatment for declining Testosterone in older males.

It has been shown to increaes serum Testosterone levels and prevent Testosterone decline from High Intensity Interval Training in middle-aged men, but did not appear to influence Testosterone levels in younger males.

Similar findings have been confirmed, with DHEA supplementation having no influence on Testosterone levels in resistance trained young males.

Ultimately, it would appear that DHEA is pretty useless if you’re young and have naturally high Testosterone levels, but if you’re suffering from low Test, it may be useful as a restoration agent.  For that reason, it makes sense to include in A-XR PCT.


Boron is an essential trace mineral which fulfills a variety of distinct physiological functions.  Given it’s widespread application throughout the human body and high bioavailability, Boron supplementation has been investigated for it’s effects on steroid hormones.

One study showed that just under 12mg of elemental Boron was able to increase serum Testosterone levels and decrease serum Estrogen levels in healthy volunteers.

However, a later study which sought to determine if this Boron-induced Testosterone increase was significant enough to increase muscle mass and strength, found that Boron supplementation had no influence on muscle mass or strength.

In other words, Boron can increase Testosterone, but not the extent that muscle protein synthesis is accelerated and rapid muscle growth occurs.  So, as a muscle-builder it kind of sucks, but as a PCT supplement it may certainly be useful.

A-XR PCT Ingredient Takeaway

A-XR PCT definitely has what it take to help restore your natural Testosterone levels, keep Estrogen at bay, and bring back your libido (should you suffer some libido-deterioration after coming off a cycle).

Is A-XR PCT Safe?

Yes, A-XR PCT is entirely safe.  None of the ingredients have ever been shown to cause toxicity at their present doses, so as long as you use it correctly, you’ll be fine.  In fact, if you’re coming off a cycle of any kind, taking A-XR PCT is a much safer bet than taking nothing at all.  That’s how gyno happens.

You need atleast an Aromatase Inhibitor (like the one found in A-XR PCT) to prevent that.

Will It Work For Serious Cycles?

If you’re running a powerful, harsh compound (or using actaul Test), you may want to consider getting something with a SERM or stacking a SERM with A-XR PCT.  It’s powerful, but won’t necessarily cover your post-cycle needs if you’re running a heavier cycle.

The Bottom Line

A-XR PCT is absolutely one of the most powerful OTC Post Cycle Therapy Supplements available.

Again, if you’re running some kind of a mega-cycle (or shooting Test), you may want to go get your hands on a SERM like Nolvadex to stack with it, but this is no doubt an effective formula that delivers on the claims made by VMI Sports.

Still not sure which PCT Supplement is right for you?  Check out our Best PCT Supplements list for some recommendations. exists to educate the supplement community and seperate the science from the hype.

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