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Msten Extreme Mass Builder by Assault Labs

Assault Labs

Msten Extreme Mass Builder by Assault Labs

Add Cycle Support (Extremely Important):

Add a Base Supplement (Helps Prevent Lethargy and Libido Crash):

Add Post Cycle Therapy (Very Important to help KEEP your gains)

Maximize your PCT! Stack with Test Booster!!:

Add Cortisol Inhibitor (Prevents muscle loss body fat increase during PCT):

Add Taurine (Helps prevent back pumps):


Looking for Dramatic Size Gains? Look No Further! Msten Extreme Mass Builder Delivers Results!

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Supplement Facts
Supplement Facts
Serving Size: 1 Capsule
Servings per container: 120
 Amount per serving%DV
Methylstenbolone 2, 17a-dimethyl-5a-androsta-1-en-17b-ol-3-one 4mg **
**(DV)Daily Value Not Established    

 Other Ingredients: Hypromellose, Stearic Acid, Magnesium Stearate, Silicon Dioxide, Microcrystalline Cellulose, Gelatin. 

Product Description

Msten Extreme Mass Builder by Assault Labs


GO FOR IT! Get the #1 ranked bulking prohormone on the market today, Msten Extreme Mass Builder, and prepare for a life changing event!


Msten Extreme Mass Builder is specifically engineered as a mass and strength building agent that helps you bust through your limits and be more than you thought possible.


Msten has over 75 Reviews, so read away and see why Msten is Ranked in first place when it comes to MASS GAINS! 

Users have reported:

-Increases in Mass

-Increases in Strength

-Increases in Muscle Density

-Increases in Definition

-Increases in Muscle Endurance

-Alpha Male Mentality

People are looking for an alternative to M-drol and all other superdrol products that were banned in 2012. Msten is here to save the day. When dosed properly results have shown to mimic SD products. The problem with all sd products beside the harshness on the liver is the conversion to estrogen. Msten Extreme Mass Builder has no conversion to estrogen and provides its users with solid size and mass gains. 

This is a solid product with solid results. Get it now! 


About the Ingedients of Msten Extreme Mass Builder: 

Msten Extreme Mass Builder's main ingredient is Methylstenbolone. Structurally, Methylstenbolone is similar to superdr0l but they differ in the type of result obtained. SD was known for really packing on size, but there was a loss of definition due to water retention. So for most users, visually you would see size gains, but there was more of a "water bloat" look.

What makes Methylstenbolone different, and in many users' eyes, better, is that it is a dry bulker, which means you can pack on the gains and lose little to no definition! Many people will actually see increased definition! 

Methylstenbolone is derived from DHT. So what does that mean for you? It means that this product cannot and will not convert to estrogen. We still always suggest that you keep an estrogen blocker on hand, as just because methylstenbolone does not convert to estrogen, doesn't mean that your body will not produce excess estrogen to keep your body's testosterone to estrogen ratio in check. Your best options for an estrogen blocker are going to be Estro Strike by Assault Labs or Estrogenex by Hi-Tech Pharmaceuticals.


Methylstenbolone is methylated, so it will be harsh on your liver and organs. With that being the case it almost mandatory to take an on cycle support. Blockade by Assault Labs is the perfect companion to Msten Extreme Mass Builder. 

Make sure to follow up you cycle with a 30 day Post Cycle Therapy. Post Cycle 3X by Vital Labs is your best option. Many people also like the stack their PCT with a Test Booster, although this is not necessary as all post cycle products have test boosting ingredients, it never hurts to add some D-Aspartic Acid in for ultimate test boosting. If you choose to stack with a test booster, DAA Max by Vital Labs is your best value option. 

Make sure once you have completed your post cycle that you take an additional 30 days off before starting another prohormone cycle. Feel free to Contact the Pros at if you need support with your cycle or figuring out what is next for you! 



Advanced Users:


Advance users tend to stack Msten with a secondary compound. Use the "Make it a Stack" option above to add the best ph so you can maximize your cycle and gains. You can add:

Halocor: A halodrol PH that provides incredible strength gains as well as lean muscle gains.

Epidex: Reduce Estrogen and Increase your muscle gains.

Maximum-LMG: A serious Mass gainer. By Adding this ph you can expect to bulk up significantly.

Power-MAG: Hard dense muscle gains make this a great choice.

The choice is yours Make it a Stack & Build your Perfect Physique!

Dosing Protocol for Msten Extreme Mass Builder:

Beginner to Intermediate:

For Best Results take 3 Capsules Daily for 30 days, with on cycle support & follow with Post Cycle Therapy. 

Advanced/ Experienced Users:

3 to 4 Caps daily for 30-45 days. 

Use with Blockade On Cycle and Finish with Proper Post Cycle Therapy. 


Msten Extreme Mass Builder Reviews:

Just like old mdrol Review by Manlyman

Rating  5 Star
Loved it no sides except minor elevated aggression. Went from 185 to 203 on a 4 week cycle with isomass gainer. Ran mg 10/20/30/20 and 4 pills of protex a day now I'm in pct with post cycle 3x . This stuff worked for me just like mdrol in terms of size and strength. In just 4 weeks my Bench went 225x4 to 225x9. 1 rep max bench from 245 to 290. Shrug 315x20 to 405x20. Squat 275x12 to 315x12.(Posted on 9/29/13)
Does exactly what it says it does Review by John
Rating  5 Star
No doubt about it!! This stuff adds muscle size period. Best prohormone that I have used so far.
(Posted on 9/27/13)

Great Product take with Blockade and Formexx Black Review by J...

Rating  5 Star
This is the second time taking this PH. Still impressed. I would compare it to M1T back in the day. Started the first four days at 8mg now currently taking 20mg. TAKE WITH BLOCKADE it is the best on cycle support better than vital labs, and contains joint support, and take Formexx Black if you're like me and a hard gainer, it will dry you up like crazy. KEEP YOUR CALORIES HIGH 4000 and keep is moderately clean unless your on Keto. I weight 216lb very lean, last cycle I went from 210 to 230, and shredded up at 216, planning on hitting that 245 mark. (Posted on 8/26/13)

To Read 50+ Reviews on Msten Extreme Mass Builder Scroll Down




WARNING: KEEP OUT OF REACH OF CHILDREN. This product is intended for adult men only. Not for use by women or anyone under 21 years of age. If you have or have had a medical condition or are currently using prescription drugs consult your physician before using this product. Avoid this product if you have any previous history of medical dysfunction or disease, including but not limited to high blood pressure, heart, kidney, thyroid, or psychiatric disease, difficulty urinating, prostate enlargement, anxiety, depression, seizure disorder, or have had a stroke. Do not combine this product with other medications or supplements. Do not exceed suggested servings.  Consult your health care professional before use if you are taking any prescription drugs.  Consult your health care practitioner before beginning any weight loss program.

Do not exceed 6 weeks of continuous use of this product. In case of accidental overdose, contact a health care professional or poison control center immediately.

As with any dietary supplement, we recommend that you consult a physician before use

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. 

Questions & Answers

Product Questions

Which is the better product. The new M-Stane by Dynamic Formulas or this product?
Currently I am taking two pills of Msten each day and spacing them anywhere from 8-12 hours apart.. Is this okay?
Currently taking 3 capsules spread out 6-8 hrs apart. Will it mess with my hormonal balance or body if for example I take all three pills at the same time or take two capsules in the late morning and the last one mid to late afternoon or vice versa?
I'm also looking to build more mass and keep fat gains to a minimum while gaining strength and I was wondering if this could be stacked with a fat burner like lean 650? Which would work better?
I'm 21 years old and weigh 120 lbs. Is it safe for me to take this?
After you're off Msten for 30 days, would it show up in your blood if your blood is drawn and medically tested?
Is it ok to take a test booster during my cycle of Msten?
Can I take a pre-workout while taking Msten and Halo-V?
I'm looking to bulk up so I was wondering what I can stack with Msten?
What kind of diet should one follow while supplementing this PH?
Can you drink alcohol while taking Msten?
Is it necessary to take a cortisol inhibitor with Msten?
How long should I wait to start my next cycle if I finished my pct last week?
I gained 20 lbs. using Msten Extreme Mass Builder. I now want to stack it with Epi 2a 3a. I'm looking to build more mass, keep fat gains to a minimum, and continue gaining strength. Is this a good stack?
How long is Msten detectable in your system when being drug tested?
If I have already taken M-sten RX at two caps ed which is 20mg, will 4 caps each day at 16 mg be under-dosed for me?
Is it a good idea to take a fat burner with Msten? I wanna bulk but reduce fat at the same time.
I am running a 4 week cycle of Xtreme Mass and Halo-V right now. Could I take Msten for the next 4 weeks to make it a total of a full 8 week cycle? Or is this going to be very hard on my liver?
Can I stack Msten with Tren Attack?
Can I still drink protein shakes and use creatine while taking this product?
Do I have to take the prohormone with a meal or on an empty stomach? Can I still take Kre Alkalyn?
Is this a safe ph for a first time user?
Is Msten likely to cause insomnia if taken too late in the day?
Is it safe for a 19 year old to use Msten?
How should I space out my doses if I wake up at 10am and go to the gym at 11am?
I'm a huge fan of Strong and applaud you guys for the quality service. As of now I just finished my "off cycle" phase of 2 months (1 month pct and one month just because). Previously I ran EPi 2a 3a and gained 10lbs as it was my first cycle. I am currently 23 years old and looking to run another cycle. Stats are as follows I am at a solid 172 lbs. but i'm looking to add more size as my chest and legs have a bit of catching up to do. I was wondering what a good compound and proper dosing protocol would look like. I am extremely lean at 7.2 % B.F and would like to stay under 190 lbs what would u guys recommend?
Is it okay to smoke cannabis while on a prohormone?
Do you really need to take liver support when taking Msten?
Will Msten make me fail a drug test?
Can I use Msten on a cut?
Why does Msten cause so many frequent trips to the bathroom? And should the doses be 8-12 hours apart if taking 2 doses daily ?
I've read that test boosters are not sufficient for PCT and that a serm like Nolvadex or Clomid is necessary when coming off of a cycle of Methylstenbolone. Is that true?
Is it mandatory to take on cycle support in between my current three doses a day ? I've read the on cycle support supplements destroy the prohormone compounds in the body.
Could I do Msten for 4 weeks but start taking Epi after the 3rd week and running it for 4 weeks like a pct? Then; before the epi cycle is complete, starting an actual pct and running it for 8 weeks?
Has anyone had muscle spasms and muscle twitching all over the body that won't go away from using Msten or Powerdrol 10?
All Reviews
Supplement Facts
Supplement Facts
Serving Size: 1 Capsule
Servings per container: 120
 Amount per serving%DV
Methylstenbolone 2, 17a-dimethyl-5a-androsta-1-en-17b-ol-3-one 4mg **
**(DV)Daily Value Not Established    

 Other Ingredients: Hypromellose, Stearic Acid, Magnesium Stearate, Silicon Dioxide, Microcrystalline Cellulose, Gelatin. 

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