RedCon1 Shield: An Evidence-Based Review

Shield is a intra/post cycle therapy formula by RedCon1, the goal of which is simple: block Estrogen.  Although many bodybuilders/athletes may use anti-Estrogen supplements to acheive a drier, leaner look, they are basically a necessity for anyone who is running a prohormone cycle.

Some prohormones are more likely to cause Estrogen-related side effects than others but any compound that increases your Testosterone will typically cause your body to compensate by producing additional Estrogen.

RedCon1 Shield



RedCon1 claims that Shield will:

  • Eliminate Gyno
  • Control Estrogen
  • Reduce Water Retention

Although it doesn’t say it on the RedCon1 official site, we’d also like to add that the inclusion of NAC in the formula at a moderate (250mg) dose also provides something in the way of liver protection on/off cycle.

Shield Ingredients

Although RedCon1 markets Shield primarily as an Estrogen-blocker–using the tagline “protect your gains” on the label–it also offers something in the way of liver protection and detoxification benefits…


N-Acetylcysteine is a highly bioavailable form of Cysteine, a sulfur-containing amino acid that serves as a precursor to Gluthione, often referred to as the body’s “Master Antioxidant”.  Gluthathione is a potent scavenger of free radicals and plays a vital role in the body’s regular detoxification processes.

Glutathione itself is not particularly bioavailable in supplement form, but NAC is highly bioavailable and has proven to be an effective means of increasing Glutathione production.  This is similar, in a sense, to the way that Citrulline–a precursor to Arginine–has proven to be a more effective supplement for increasing Arginine levels than supplemental Arginine itself.

Cysteine has been studied under various circumstances involving Liver toxicity and is effective as both a preventative measure and to reverse oxidative damage.  This makes it a must have in any prohormone support stack, but most companies tend to under-dose it.  We discuss NAC in-depth in our article: 3 Supplements For Optimizing Liver Health.

RedCon1, on the other hand, has packed in 500mg of NAC in each serving of Shield, about double what you’ll find in the average liver support supplement.

Androsta-3,5-diene-7, 17-dione (Arimastane)

Androsta-3,5-diene-7, 17-dione, more commonly referred to as Arimistane, is what is known as “Suicide Aromatase Inhibitor“, Arimistane permanently binds to Aromatase–the ezyme that catalyzes the conversion of Androgens to Estrogens–blocking it’s action.

Due to the fact that Arimastane is a relatively new compound, there isn’t much research on it.  Still, anecdotal reports indicate it can be quite effective for keeping Estrogen levels in check both intra and post-cycle.

Shield Ingredient Takeaway

Due to the use of Arimistane, Shield definitely has what it takes to keep Estrogen in check and help avoid Estrogen related side effects from prohormone cycles.  As previously stated, it also offers something in the way of liver protection–courtesy of N-Acetyl-Cysteine–but if you’re seriously trying to maximize your liver protection on cycle, you should use some additional supports.

Is RedCon1 Shield Safe?

NAC is not only safe but is downright healthy.  Even people who don’t take prohormones could benefit from NAC supplemetation (especially if you drink a lot!).  Arimistane, on the other hand, has a lot less research to evaluate so it’s tough to draw conclusions there.  Anecdotal evidence indicates that it’s pretty safe though since there are no records of any adverse reports and at this point it’s been used in tons of supplements.

As with any supplement, sticking with dosing recommendations is a good idea.

Where To Buy Shield

Like all RedCon1 supplements, Shield is available at a wide range of retailers.  Among the most notable are:

Based on the way Aaron Singerman–Redcon1’s CEO–has done business in the past, we expect to see many more retailers adopt RedCon1 supplements in the future.  If you know of anywhere else they’re available, feel free to comment below.

The Bottom Line

RedCon1 has done a fine job with Shield and if you’re running any sort of prohormone cycle, you could definitely benefit from taking a formula like this.  Most people use Arimistane (the primary active ingredient in Shield) post-cycle but if you’re using a prohormone that Aromatizes, it can be taken while on cycle as well. exists to educate the supplement community and seperate the science from the hype.

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