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Kaged Muscle

Ferodrox , 60 Vegetable Capsules

Helps Support Healthy Testosterone and Cortisol Balance*
Scientifically Proven Patented Ingredients to Support Natural Testosterone Production*
8.8  out of 10  (38 Reviews)

Product Overview

Kaged Muscle


  • Helps Maintain Testosterone Levels Within the Normal Healthy Range*
  • Helps Maintain Testosterone and Cortisol Ratio Within the Normal Healthy Range*
  • Increases Lean Muscle Mass and Strength*
  • Improves Stamina and Performance*
  • Helps Promote Optimal Recovery*
Kaged Muscle Ferodrox bottle


Tongkat Ali


Ashwagandha Extract


Purified Shilajit


Zinc Monomethionine





There's no question that testosterone is the king of muscle building hormones. For anyone wanting to add size, boost strength and performance, lose fat, and heighten sex drive, maintaining a healthy testosterone to cortisol ratio is critical. The problem is, testosterone levels can fluctuate, whether due to age, stress, diet, or just regular, intense training protocols. It can be near impossible to gain power over these fluctuations with most other dietary supplements.

Ferodrox™ is an industry breakthrough created to help you maintain testosterone levels within the normal healthy range.* Each ingredient was carefully selected and included in ultra-precise amounts to deliver unmatched results.* Unlike many other supplements on the market, the Ferodrox formula is fully disclosed, so you know exactly how much of each ingredient you're getting.

Our research team was tasked with sourcing the highest quality, patented ingredients backed by real science, with no cost limitations. In fact, some of the ingredients cost up to ten times more than the generic ingredients used by many of our competitors.

Many companies borrow claims from these premium patented ingredients, but use cheaper, poorer quality, generic materials that have not been proven to be effective. This unethical and deceitful marketing practice is far too common in the dietary supplement industry, and allows companies to increase their profits while giving you inferior ingredients. Any brand claiming that these cheaper, lower quality ingredients are as safe and effective as those that have been clinically researched and patented, simply aren't being truthful.

If your supplement isn't formulated with scientifically proven ingredients such as KSM-66®, LJ100®, PrimaVie®, and L-OptiZinc®, then it's time for a change.*

Ferodrox's powerful matrix has six superior ingredients scientifically proven to amplify your results.*


LJ100 Tongkat Ali, or Eurycoma longifolia, is the only science-based Eurycoma longifolia extract, standardized to contain not less than 22% bioactive "eurypeptides" and 40% glycosaponins. The bioactive "eurypeptides" are derived from the root of the plant. Co-discovered and -researched in collaboration with the esteemed Massachusetts Institute of Technology (MIT), the LJ100 patented Eurycoma has been shown to exert proandrogenic effects.[1]

Each serving of Ferodrox delivers a powerful 200mg of LJ100 Tongkat Ali to encourage favorable hormone balance by combating cortisol and supporting peak testosterone-to-cortisol ratio within the normal range.* Cortisol levels rise in response to frequent, intense training and other forms of physiological stress. Which, under healthy conditions, directly influences your body's testosterone response. The faster and more effectively you can bring cortisol under control the greater your total anabolic environment and better your recovery.*

In a study published in the Journal of the International Society of Sports Nutrition, subjects with moderate stress supplemented with 200mg of LJ100. After four weeks, researchers measured stress hormones in the body and found that cortisol levels decreased by over 16% while testosterone levels increased by 37%!* Overall, the anabolic environment—using the ratio of circulating total testosterone compared to cortisol—improved by an incredible 36%.*[2]

Research is still unclear as to the precise molecular pathways and biochemistry, but evidence suggests that LJ100 may increase the bioavailability of testosterone by lowering the amount of sex hormone binding globulin, or SHBG, and reducing the conversion of testosterone to estrogen.*[3,4] Once you hit biological maturity at about age 30, SHBG begins to increase steadily.

LJ100 is the only Tongkat Ali clinically proven to maintain testosterone levels within the normal healthy range.* This powerful patented ingredient is backed by 13 human studies, and has proven efficacy and safety. Made from wild-crafted Tongkat Ali root from the rainforests of Malaysia, it's produced using a proprietary extraction technology.


KSM-66 Ashwagandha (Withania somnifera) root extract works synergistically to help reinforce the powerful effects of LJ100 in maintaining cortisol levels within the normal healthy range.* The Ferodrox formula delivers a precise 600mg of KSM-66 Ashwagandha which has been scientifically shown to significantly lower serum cortisol levels.* In a randomized, double-blind, placebo-controlled study, researchers gave 64 subjects 600mg of KSM-66 or a placebo for eight weeks. At the end of the study, the KSM-66-supplemented individuals had decreased their cortisol levels by more than 266% versus the placebo.*[5]

Research has also shown that supplementing with 600 mg of KSM-66 Ashwagandha daily can increase muscle mass, total testosterone, strength, reduce bodyfat[6], and enhance endurance[7].* In fact, supplementing with KSM-66 while also resistance training three times per week, for a period of 12 weeks, resulted in:

  • Up to 139% and 52% increases in bench press and leg strength*
  • Over 3% and 17% increases in chest and upper arm size*
  • More than 128% improvement versus placebo for change in bodyfat*
  • Over 15% increase in total testosterone*

KSM-66 is the world's most effective and pure, 100% organic certified Ashwagandha root extract in existence. It's derived from a proprietary alcohol and solvent-free, water extraction technology which results in a highly concentrated, full spectrum extract that preserves an optimally effective balance of natural constituents of the herb. In fact, KSM-66 has the highest percentage of naturally-occuring withanolides of root-only extracts available on the market, with more than 5% concentrations as measured by HPLC and negligible levels of the undesirable Withaferin A.

This cutting-edge, premium patented ingredient is backed by the most extensive set of research studies and clinical trials of any Ashwagandha available, cementing our decision to include it in the Ferodrox formula.


PrimaVie is a clinically studied, premium purified shilajit containing dibenzo-a-pyrones (DBPs), DBP-Chromoproteins (DCP), fulvic acid and over 40 different minerals. This powerful organo-mineral compound is obtained from sedimentary rocks in the Himalayan mountains at altitudes between 1000 and 5000 meters. Shilajit is an important remedy of the ayurvedic and has been used for over 3,000 years as a rejuvenator and adaptogen in a variety of conditions.

Together, pure shilajit and Ashwagandha is a powerful combination. Historically, the combination has been used widely as an effective supplement to boost energy levels, and improve libido and overall health.* Ferodrox contains 200mg of PrimaVie purified shilajit to help amplify the effects of KSM-66 Ashwagandha and LJ100® Tongkat Ali, unlocking their powerful synergistic effects.*

PrimaVie purified shilajit extract is manufactured using state of the art chemical-free aqueous processing technology, to eliminate any impurities and maximize potency. In addition, PrimaVie® undergoes a proprietary process to remove harmful heavy metals and is GRAS affirmed and Proposition 65 compliant. Many other generic forms of shilajit have been found to contain high levels of arsenic and fail to meet the standards set out by Proposition 65.


Zinc is one of 24 essential minerals; however, the body cannot synthesize its own, so it must be taken in via diet or supplementation. It plays a crucial role in enzymes[7], immune system function[8,9], and protein synthesis[9]. The average person requires roughly 10-15mg of zinc daily to support crucial endocrine functions.* In fact, balancing micronutrient deficiencies is one of the key factors in maintaining testosterone levels within the normal healthy range.*

However, the benefits of this important mineral are dependent on the amount of zinc that is actually absorbed and utilized by the body. The zinc used in the Ferodrox formula is a highly absorbable and premium patented form of zinc. L-OptiZinc, which is zinc organically bound to methionine, has been scientifically proven absorbed better and sustain higher plasma levels compared to other zinc forms.*[10] Ferodrox includes 30 mg of patented L-OptiZinc® zinc L-monomethionine in each daily serving.


3,3'-Diindolymethane, or DIM, is a powerful phytochemical derived from cruciferous vegetables such as cabbage, broccoli and cauliflower. Research shows that DIM helps maintain estrogen levels within the normal healthy range, which in turn helps maintain testosterone levels within the normal healthy range.*

The Ferdrox formula contains 120mg of an ultrapure, bioavailable form of DIM. It's important to note that not all formulas using DIM are effective due to their sources or delivery methods. Some companies use low quality sources of DIM from starting materials that contain benzene, a toxic chemical compound that is a known carcinogen in high levels. The DIM used in Ferodrox has been thoroughly tested and proven to be benzene-free. Also, DIM consumed on its own or in regular capsule form, is ineffective. Ferodrox utilizes BioPerine black pepper extract and an innovative capsule technology that enhances the absorption and bioavailability of DIM.*


Ferodrox contains 10mg of BioPerine®, a purified extract of black pepper, or 95% piperine, that works synergistically with DIM to help enhance the absorption of DIM.* BioPerine® is the only piperine supplement to have undergone rigorous clinical evaluation to verify its safety and efficacy, and has obtained patented status.

LJ100 13 Human Clinical Trials - Patent NO US 7,123,117 B2

With six high quality ingredients working synergistically to turn you into an unstoppable muscle building machine, Kaged Muscle researchers have created a monster with Ferodrox.* But Kaged Muscle scientists didn't stop at premium ingredients.

Ferodrox's powerful ingredients are unleashed with its precise advanced delivery technology. Engineered with superior delayed release vegetable capsules, the ingredients in Ferodrox's formula begin to shuttle into your system within 20 minutes of reaching the stomach.* Unlike traditional capsules, this unique delivery technology allows the ingredients in Ferodrox to bypass the stomach and be rapidly taken up into the small intestines.* This means there is less threat of Ferodrox's ferocious power being destroyed in the low pH (acidic) of the stomach. The extended action of the unique delivery technology significantly reduces ingredient degradation compared with conventional, immediate release capsules used for most other products.

With dramatically enhanced absorption, Ferodrox™ can permeate your cells and begin to help stimulate gains in size and strength from virtually every conceivable angle.* Never in bodybuilding has a vegetable capsule technology so advanced been used to deliver the superior effects of such a revolutionary supplement.*

  1. Sambandan, T.G., Rha, C.K., Kadir A.A., Aminudim, N, Saad, J, Mohammed. M. Bioactive fraction of Eurycoma longifolia. United States Patent 7,132,117. Issued November 7, 2006.
  2. Talbott S., et al. J Inter Soc Sports Nutr 2013;10:28.
  3. Henkel R.R., et al. Phytother Res 2014;28(4):544-50.
  4. Low, B.S., et al. J Ethnopharmacol 2013;149(1):201-7.
  5. Chandrasekhar, K., et al. Indian J Psychol Med 2012; 34(3):255.
  6. Choudhary, B., et al. Inter Quart J Res Ayurveda 2015; 36(1):63.
  7. Sandstead, H.H. J Lab Clin Med 1994; 124: 322.
  8. Solomons, N.W. Nutr Rev 1998; 56:27.
  9. Prasad, A.S. Nutr 1995; 11:93.
  10. Rosado J.L., et al. Nutr Res 1993; 13:1141.

Ratings & Reviews

Overall Rating
38 Ratings
Verified Buyer Rating
28 Ratings
By clicking the button above, you agree to entering the Bodybuilding.com Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
Jun 02, 2020
Verified Buyer

I could really feel the effects during the first 3 weeks. After that I didn’t notice anything. I’m 31 270lbs and have been working out since 7th grade. I noticed I didn’t have as much energy and couldn’t push into a new max for the past year on Squat, bench, or deadlifts. Once I focused more on my macros, then I really noticed a difference In my energy in the weight room and my mood changed too. Just eat healthier. I love Kaged products!! This one however didn’t do it for me. I tried this product a few months later to see if I would get that same energy, like I did the first time I took it but nothing happened.

Oct 25, 2019

Great product! I have used several other natural test boosters in the past and none hold a candle to Ferodrox. Noticed a decent change in energy levels, mood and libido. I talke the product on an empty stomach, which is not recommended on the bottle and it does not bother me like some others have in the past. I love Kaged supps and will continue to support them.

Aug 18, 2019
Verified Buyer

You have to understand this is a testosterone SUPPORT matrix. It’s meant to assist your testosterone by getting to healthy levels. It’s tough to say how much I can tell a difference with and without it because it’s not HGH or a medicaly prescribed test booster. From comparing to other products it does have an excellent ingredient profile. The ingredients is the reason I gave it a 9/10 versus a 7 or 8.

Jul 03, 2019

I’m a big fan of Kaged Muscle, and use almost all the other products. However, I didn’t notice anything from this. I’m pretty disappointed in that. I took it faithfully for a couple months.

Mar 08, 2019
Verified Buyer

Great test booster, best I've tried. Not a single bad workout taking this, massive pump and strength! Perfect for a man in his 30's

Jan 29, 2019
Verified Buyer

I am a 48 year old male. I train a minimum of 4 days a week. Ferodrox has helped me lose more fat and up the amount of weight I work with. For someone looking to transform and get down to around 250lbs, I see this and other Kaged Muscle supplements keeping me on track.

Sep 10, 2018
Verified Buyer

I've used many Kaged Muscle products over the years and have always been happy. I was so excited to try this one as Kris made so many claims before release on how this one is different from all the other test boosters. Unfortunately, this did absolutely nothing except take $120 out of my bank account with the two bottles I ordered. Not falling for the hype any more as I am tired of wasting money on supplements that don't do anything. Hard work, dedication, diet, protein and creatine is all for me now!

Sep 05, 2018

I've used Kaged Muscle products for many years and stand by their products but I'm afraid this is not one I can recommend. I used Ferodrox as prescribed for 3 months and it did absolutely nothing for me, sorry. 49 year old male who trains 5 times a week.

Aug 18, 2018
Verified Buyer

Best T-booster i have tried and tested! I am 40 so naturally testosterone levels are on the decline and i have tried a few T-boosting products so far. This one seems to be mosy effective of them all. By the end of the first week taking it I got better energy and more strength despite constant calorie deficit. The only minus is its price but I guess one has to pay for quality products

Aug 16, 2018
Verified Buyer

Did nothing special for me

Aug 01, 2018
Verified Buyer

Been taking for almost a month now and I already can tell a huge difference!! Hitting higher weights! Love this product

Jul 11, 2018
Verified Buyer

This stuff works!!!! Absolutely amazing!! More drive and energy and at 47 and wanting to workout more than ever, that’s huge!! I believe in Kaged Muscle products ALWAYS!!!

Jul 06, 2018
Verified Buyer

Awesome product. I used Ferodrox (along with clean burn) for 8 weeks during my contest prep and it definately made my cut more bearable. This is THE best (legal) fat loss combo that mine can buy. I went from about 9% body fat to 5% with this combo, and I actually GAINED strength. The Ferodrox adds a substantial amount of drive and focus that I now miss while taking a break. I will definately be using this combo again in the near future!

Jun 12, 2018
Verified Buyer

I'm a big fan of KM, however this product did nothing for me and I took it for a month, I was not expecting anything crazy, maybe a boost in the gym. I'm giving an 8 since it appears to work for others and I trust KM products.

May 27, 2018
Verified Buyer

Before this product, I thought I was just tired from wrestling,work and school but once I've started to take Ferodrox, I haven't been tired or neglected from my gym routine since and I've only been taking it for three weeks. Combined with my diet, I've been loosing body fat like crazy. I went to the doctors office and my testosterone levels are leveled out and normal so I'm very happy with this product and I will be using it for now on. Thank you Kris Gethin for actually caring for what we put in our bodies because before your products I've given up on supplements for 3 years so thank you for helping me with my health and I've reached a new level of fitness and I'm just going to keep growing. 10/10

What's in Kaged Muscle Ferodrox

60 Vegetable Capsules
Serving Size: 2 capsules
Servings Per Container: 30
Amount Per Serving % DV
Zinc (OptiZinc® [Zinc Monomethionine]) 30 mg 200%†
KSM-66® Ashwagandha Extract (Withania somnifera [root] standardized to 5% withanolides) 600 mg
LJ100® Eurycoma Longifolia Root Extract (standardized to contain 22% Bioactive Eurypeptides, 40% Glyco Saponins, 30% Polysacharides) 200 mg
PrimaVie® (Shilajit fulvic acid complex) 200 mg
Diindolymethane (MICROPURE®) 120 mg
BioPerine® (Piper Nigrum, fruit [standardized to min. 95% piperine]) 10 mg
* Percent Daily Values are based on a 2,000 calorie diet.
† Daily Percent not established.
Other Ingredients:
Delayed Release Capsule Technology (Hypromellose, Gellan Gum), Rice Bran Extract, Maltodextrin, Rice Extract Blend (Rice Extract, Rice Hulls, Gum Arabic, Sunflower Oil), Rice Hulls, Natural Flavor, Silicon Dioxide, L-Methionine.

Directions For Ferodrox: Take 2 capsules in the morning or 1 capsule in the morning and 1 capsule in the afternoon, preferably with food. 

Warnings: Consult your physician prior to using this product if you are pregnant, nursing, under 18 years of age, taking medication or have a medical condition. Immediately discontinue use and contact your physician if any adverse reactions occur. Keep out of reach of children. Store in a cool, dry place away from excessive heat.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.