If you are not trolling us and are actually telling the truth, then you have a LOT to learn. Read the following and then accept them as truth without hesitation. You must do this before you can expect to go anywhere.
1.) You are not anywhere close to maximizing your genetic potential. In fact, you have barely even begun to scratch the surface at 5'8 and 140 lbs.
2.) Your lack of progress is not due to being genetically inferior.
3.) Your lack of progress is because of mistakes YOU are making...big ones. You have no clue how to eat to add mass and you probably don't know how to contruct a proper training program either.
I a nutshell, this is what you need to do.
Increase your calories until you start to gain weight. Count your calories every day and make sure you take in the predetermined amount every day. If you have not gained weight in one week, increase them by another 500. Continue doing this until you begin to gain weight. Normally, I would advise waiting at least 2 weeks to notice weight gains, but in your case, muscle gains (and therefore weight gains) should come much easier, since your development is at such a low levels. When combined witha proper training program and adequate rest, you should be able to gain muscle & strength at a fairly rapid rate for at least 3-4 months, after which point gains will slow down, but will continue at a decent rate for about a year. It is very realistic for someone at your level of dvelopment to be able to add about 30 lbs of mostly lean mss within one year. I know we commonly hear people say that gaining 5-10 lbs per year is considered "great" gains, but for a beginner, which you are, it is often possible to add 30, 40...or even more pounds in a single year. I have seen this happen many, many times. I added 41 lbs of mostly lean mass in my first 12 weeks of serious training at age 22...drug-free! I went from 167 to 208 at 6'1. Of course, these are the people who know what in the fuck they are doing and bust their ass to make it happen. Half-ass training or piss-poor diets will not result in anywhere close to these kind of gains.
An example of a solid beginner's mass-building program would be a routine based around the mass-building basics, which are mostly compound exercises. Some isolation exercises are needed, as not every muscle can be adequately worked only with compound movements (such as side & read delts), but they should lon;y be included when "necessary"...not just because you wnat to do them. To many beginners see all the fancy machines and end up neflecting the most important mass-builders.
Here are some of the best exercises, in general, for adding muscle tissue. Adding a bunch of isolation exercises to them will not increase your growth rate, but will usually slow it down, as the body will then have too much to recover from to grow optimally. More advanced BB'rs will benefit from a larger exercise selection, as adding overall mass is not their only goal. Here you go:
Upper-legs: Full squats, Leg press, Stiff-leg deadlifts, Reverse leg curls
Chest: Flat barbell press, Incline barbell press, Dips
Back: Deadlifts, Chins, Barbell/T-bar rows
Delts: Overhead front barbell press, Dumbbell side laterals, Rear laterals (machine or dumbbell, whichever you feel more in the muscle)
Lower-legs: Standing & Seated calve raises.
Biceps & Triceps: There are many good biceps and triceps exercises, so select 2 of them (and don't pick shit like one arm cable concentration curls either) for both bis and tris.
-- Alternate between stiff-leg deads (for hams) and regular deads (for back) from week to week, as the lower back cannot handle doing both regular deads and stiff-legs each week. It is a sure recipe for overtraining and reduced gains.
* Perform 3 working-sets of each exercise.
* Train in the 6-10 rep range for upper-body exercises and 10-15 for leg exercises
* Rest an average of 3-5 minutes between sets between sets, with 2-3 minutes for less taxing exercises (such as curls)...and as many as 5 minutes for exercises like deads or squats. The goal is to recover your strength inbetween sets so you can handle maximum poundages from set to set. For a beginner this is important, as progressive resistance is the best way for a beginner to not only add size & strength, but to lay a solid foundation for growth further on down the road. While strength can vary enormously between BB'rs of equivalent size, in general, you will never get massive without adding a lot of strength. When is the last time you saw someone with a chest the size of Arnold, Branch, or Ronnie who wasn't damn strong? Exactly.
* Train each bodypart once every 5-7 days.
Get at least 8 hours of sleep each night...and if you do all of these things consistenly, you will make much quicker progress than you have been. Lastly, do NOT participate in any regular, rigorous physical activity. Doing shit like playing 2 basketball hour ball games with your budies 4-5 days per week will significanly impair your progress...as will working jobs which require a lot of physical effort, such a construction, roofing, landscaping, etc. Doing excessive running will have the same effect, so if you are a long distancerunner or something similar, you can kiss your muscle-buliding dreams good bye. This also means no excessive cardio. Some cardio is good for growth, but you want to limit it to maybe 3 days per week at 20-30 minutes per session, max. Or, if you do interval cardio, keep it brief and infrequent.
Guys trying to add muslce at a rapid rate need to tailor their lives around this goal, if they want to suceed. This doesn't mean you can never deviate from the plan, but it should not be a regular occurence. I c only go into so much detail here, but one last thing about your diet...forget any of that low-carb bullshit. You will NEVER add muscle quickly on a low-carb diet...and often gains stop completely after a short time. If you want to be ripped & huge, you need to get huge first...getting ripped comes later, as you will NEVER get huge while trying to maintain a ripped physique. You need to focus on one goal at a time. You should take in at leasr 1 gram of protein per poud of bodyweight...and complex carbs should make up the bulk of your diet. Fats will make up your remaining calories.
While you are not yet ready to use a product like Super DMZ, if you do decide to use it, at least do yourself a HUGE favor and correct your program as shown above before beginning. You would make 10X the gains because of it. The fact that you are only 18 is really not what bothers me. The fact that you are at a low-level of development isn't my main concern either. Sure, it would be better if you were older and had more experience, but what really bothers me is that you are turning to steroids before you even know how to eat or train for growth. That is brutally apparent based on your current development. If you did know how to do these things, you woudn't be telling us you have maxed out your genetic potential and can't get any stronger or bigger, even though you are only 5'8 and 140 lbs. You need to educate yourself before using hormones...not because of safety reasons...but because you will waste your time.
On top of all that, you seriously need to educate yourself on steroids before using them. You don't have a fucking clue what steroids are or how they work. In your OP, you state the following..."It is to my understanding after doing alot of research that epistane is mild and convert to testosterone when it gets into the body which is why it is mild since the body already produces testosterone unlike dianabol which transforms into something else". If you have done a "LOT" of reserach, I would like to know where in the fuck you are getting your information...because I have NEVER heard anyone say anything like what you just said...and I have been posting on forums all over for years! For one, Epistane does not convert to testosterone (or anything else)...it is an active steroid in its ow right. Two, dianabol does not convert to aything....it is also a actve steroid. Dianabol's side effects are due to the effects of that particular steroid and has nothing to do with testosterone or conversion. Testosterone is actually one of the most side effect ridden sterois of all...it can cause hair loss, acne, oily skin, gyno, aggression, enlarged prostate, hair growth on the body, water retention, etc. Does that sound "mild" to you? You don't even know basic informatoon about AAS, so I call bullshit on you suppoosedly doing a LOT of research...because no one is saying the shit you are saying. You could go on any BB'ing board and find reliable info on these drugs, yet you haven't leared anything in all your many searches for information. How is that?
Do yourself anither favir and buy Lewellyn's book, called "Anabolics". I believe it is on its 10th or 11th edition, although I am not sure. This will educate you on the basics of AAS in many areas.