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Over 20 Years of DIESEL TEST and still the undisputed champion of herbal test boosters!

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DIESEL TEST® Hardcore – The Original Heavyweight of Natural Test Boosters

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Harder. Stronger. Proven.

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DIESEL TEST® Hardcore has been the benchmark for serious strength, drive, and performance since 2005. When other products faded, Diesel stayed on top — dominating gym bags and supplement shelves for nearly two decades with results that speak louder than hype.

 

Where most “herbal test boosters” make claims, DIESEL TEST® Hardcore delivers real-world results that users can feel — and even see in bloodwork. It’s engineered for lifters, athletes, and men who train with intensity and expect the same from their supplements.

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The Hardcore Difference

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Most of today’s so-called test boosters are weak, underdosed, and one-dimensional — trying to address only one thing: either male potency, total testosterone, or nitric oxide. That’s why results fade fast or never come at all.

DIESEL TEST® Hardcore is different. It hits every major system that drives performance and recovery. It supports both total and free testosterone, while also helping to keep bad estrogen, cortisol, and prolactin in check — key factors that can limit strength, gains, and long-term results.

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The new 160-Tablet Formula released late 2025 hits harder than ever with Nitric Oxide (NO) effects that outperform most standalone NO products — many of which cost more but do far less. DIESEL TEST® Hardcore combines hormonal support, male potency enhancement, and NO-driven power into one unbeatable formula.

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What You Can Expect

From your first week, expect to feel sharper, stronger, and more motivated. Training intensity climbs, recovery improves, and your body responds like it should. Male potency often increases dramatically — a natural result of optimized balance, blood flow, and drive.

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DIESEL TEST® Hardcore users commonly report:
 

• Increased total and free testosterone

• Enhanced male potency and performance

• Stronger, harder muscle tone

• Improved strength, power, and endurance

• Elevated motivation and “alpha” mindset

• Reduced Cortisol and estrogen activity

• Faster recovery between sessions

• Noticeable Nitric Oxide pumps

• Improved muscle-to-fat ratio and body composition
   

And unlike underdosed or “stack-required” boosters, DIESEL TEST® Hardcore performs solo. No filler products. No hype. Just results.

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Real Results, Real Proof

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DIESEL TEST® remains the only test booster that users have verified with their own bloodwork for over a decade — showing consistent increases in total and free testosterone, with measurable reductions in estradiol, cortisol, and prolactin.
This isn’t marketing — it’s history. Since 2005, Diesel users have proven what the rest of the market just claims.

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The Diesel Guarantee

Stop wasting money on overhyped, underdosed “stackable” products.
If you want a single formula that covers everything — strength, drive, recovery, mood, and performance — you want DIESEL TEST® Hardcore.

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This is not a beginner’s supplement. Start with 1–2 tablets per day to assess tolerance. Many users find 3–4 tablets daily deliver incredible results, but be aware: this formula is strong. Aggression, energy, and male potency may rise quickly — if results become too intense, reduce dosage or use a 2-days-on / 1-day-off pattern.

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Legendary Features

• Supports total and free testosterone

• Enhances male potency, performance, and motivation

• Boosts muscle hardness and training aggression

• Promotes nitric oxide pumps and vascularity

• Helps balance cortisol, estrogen, and prolactin

• Improves recovery and lean muscle development

• 100% legal, 100% natural – no banned or experimental ingredients

• Backed by 20 years of proven results

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DIESEL TEST® Hardcore – The Original. The Standard. Still the Strongest.
When it comes to real test boosters, no other brand hits like GET DIESEL!

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FDA Disclaimer

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.

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Hormone test done by consumers of DIESEL TEST:

 

This is PRE Diesel Test. (Reference range low/high).

24 year old tester done late summer/fall 2005

Testosterone 23 nmol/L or 663ng/dl (5.0-25.0)
Free Testosterone 70 pmol/L (60.0-130.0)

This is AFTER Diesel Test new Formula. (28 days of use)

Testosterone 28 nmol/L or 806.4ng/dl (5.25.0 is ref range)
Free Testosterone 125 pmol/L (60.0-130.0 is ref range)

 

This translates to a rise of in total testosterone of approximately 22% but even more important a RISE IN FREE TESTOSTERONE of 80%.....that’s almost double his day one levels of free testosterone…..using a 100% completely natural and legal world-wide herbal supplement (DIESEL TEST)!  Despite all the B.S. talked by other herbal testosterone booster manufactures, no one has posted any testosterone test done solely by their customers.  This customer actually started with total testosterone on the high end being 23 nmol/L.  DIESEL TEST took him over the reference range of 5-25 nmol/L to 28 nmol/L!!

http://forum.bodybuilding.com/showthread.php?t=582215

 

 

Here are more comprehensive androgen test paid for solely by the consumer of DIESEL TEST (first lot, not as strong as current formula).

24 year old tester done spring 2005.

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Hormone: Prolactin
Start: 17.7  Reference Range: 2.5 – 17.0  Day 25: 10.6  Change: −7.1 (−40%)

Hormone: Cortisol
Start: 21.4  Reference Range: 4.0 – 22.0  Day 25: 14.0  Change: −7.4 (−35%)

Hormone: Estradiol
Start: <20  Reference Range: <57             Day 25: <15  Change: −5 (−25%)

Hormone: TSH
Start: 3.65 Reference Range: 0.45 – 4.50  Day 25: 2.79  Change: −0.86 (−24%)

Hormone: FSH
Start: 2.1  Reference Range: 0.7 – 11.1    Day 25: 2.0  Change: −0.1 (−4%)

Hormone: LH
Start: 3.5  Reference Range: 0.8 – 7.6    Day 25: 2.3  Change: −1.2 (−35%)

Hormone: Total Testosterone
Start: 373  Reference Range: 189 – 1111   Day 25: 485  Change: +30%

Hormone: Free Testosterone
Start: 85.5  Reference Range: 40.0 – 150  Day 25: 115.2  Change: +35%

 

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Looks like DIESEL TEST (in 25 days in a 23 yr. old male) produces these effects:

Reduced Cortisol 35%
Reduced Prolactin by 40%
Increased total testosterone by 30%
Increased free testosterone by 35%

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Remember this was the initial formula of DIESEL TEST released around spring 2005, and then current formulation is much stronger/effective! 

Links to actual logs where testers posted pre and post androgen results:

http://forum.bodybuilding.com/showthread.php?t=456678  (no longer active they shut down their forum)

 

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RESULTS:

total test: 902 ng/DL vs. 820 ng/DL
free test: 3.85 ng/DL vs. 3.10 ng/DL

TOTAL TEST INCREASE: 10%
FREE TEST INCREASE: 24%

http://forum.bodybuilding.com/showth...page=2&post#41

 

Total Testosterone - from 176 ng/dl to 457 ng/dl (normal range 240 - 820)
Free Test - from 3.5 to 13.4 (normal range 8.7 - 25)
Lh UP from 1.2 to 4.1

So:

Total test increased 260% or 2.6 fold almost 3X increase
free test increased 383% 3.83 fold almost 4X increase
LH increased 342% 3.42 fold almost 3.5X

estodiol went up a little from 19 to 22 about 20%

http://forum.bodybuilding.com/showthread.php?t=800994

 

Final Review (DTH during PCT (post cycle therapy with a SERM)

Needless to say I went from being pretty shutdown with little Grape nuts to a very successful post cycle therapy. I had started to make a comeback on the SERM but definitely felt it kick in after just 3 days on the DTH. However note I had preloaded with DT2010 for the preceding 5 days so I was able to start the DTH at 5 caps/day.

Things to note. During my post cycle therapy I hit numerous PR's including my all time best Bench of 630, a raw Deadlift of 660, and a 755 Squat. Most of these were set 3-5 weeks after completion of PH cycle. My energy levels were up, my libido picked up over where it had been precycle, and strength levels continued to remain strong all through my post cycle therapy.

Only negative I noted was that I had restless sleep when I took the last dose within 5-6hrs or less before I went to bed.
 

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My Total Test Levels:

February 136
After Anti-estrogen/free test herbal product (just before PH cycle) 453
After completion SERM/Diesel Test Hardcore PCT 686

That's correct. My total test is up 233 points over what they were prior to my suppressive cycle!!!

Unfortunately my Liver Enzymes are still a bit elevated (AST 111, ALT 82) so I will have to go back on LL and mega dose milk thistle and minimize supplement intake till these come back in line.

http://anabolicminds.com/forum/supplement-reviews-logs/69279-hardcore-diesel-pct-4.html

 

 

Consumer reviews/comments for DIESEL TEST Hardcore:

DTH is Fukin STRONG!

I had been taking alpha drive xl for about 5 weeks previous to this and although it was good in terms of being cheap and somewhat effective, I really wasn't blown away in terms of test boosting effects.

I kept reading all of these ridiculously good reviews about DTH and figured since everyone keeping praising it, (mind you none of these people were paid by chuck or getdiesel), why not try out something natural while I cut to preserve muscle and help me out with that alpha male feeling you get from certain anabolics.

To make it short and sweet, I got my bottle about a week ago and have been running 6 tabs a day, and this is what i have experienced:

Aggression : Honestly it feels like I'm on a tren-like substance to say the least. From the moment I wake up in the morning, I feel like the world is mine for the taking. In the gym, I get the feeling of wanting to tear apart every set. And when it comes to people, this is where it is a bit TOO strong, which i never thought I would say. I have zero patience with anyone, which is very unlike me, and when someone says something I remotely don't like, I have been blowing up and letting EVERYONE have a piece of my mind. Thats not me and I can't really stand wanting to rip somebody's head off 24/7, because I have gotten borderline close to it numerous times within the past few days.

Acne has also increased but that was to be expected. Strength is going up only very slightly because I am cutting and on top of that I train HST style, which is not geared towards strength.

Balls... well my bolas are definitely mas grande, but my libido is going down a tad.

I have decided to drop down to 5 caps a day because of the crazy agro, the acne, and the lowered libido. I'm pretty sure that when I drop it back down to 5 it will be the perfect balance.

Once again chuck, you have created another believer. Ill post more as I continue to use this awesome product if people are interested. Thx guys

-derty

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Just wait, it gets better in the upcoming weeks! While the 'alpha male' attitude rules, don't let the aggression get you into trouble! I was written up for being 'insubordinate' and got a talking to for being 'intimidating'.

Definitely drop the dose down if you libido has dipped. Mine is RAGING at 6/day.

Absolutely love this stuff.

-Xodus

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I did 2 bottles back to back at 6 a day and it was a f***ng  intense event. I love this stuff and give 2 thumbs way up. I wanted to punch every person I saw and I loved every second of it. 

-Tripdog

Chuck Diesel comment:  If you get to aggressive don't use 6 a day, reduce your dosage......but some people love the aggression.

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Day 8: Nice workout and great pumps. DTH is doing a great thermogenic imitation; I was doing some major sweating, and I felt really energized. Libido is WAAAAAYYY up! I'm also noticing some increased oily skin. I have been getting great sleep while on DTH...I like this stuff

Day 9: I noticed veins all over after my run  Libido is still off the charts...muscles are starting to look a little more dense. This is one of those products that delivers without the need to stack...nice.

-dark_man812

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Day 9:

Wow, I actually found another supplement I would buy again. Which brings the list up to 4 good supplements I respond to. My mood is really elevated. By my second dose I keep thinking "Do I really need another dose?" because at that point I'm already pretty hyper. At the gym yesterday I barely took any breaks in between sets because I would recover from the last set really fast. I definitely notice some sort of mind muscle connection as I can push out a few more reps then normal. I'm just not used to supps working on me so I'm pretty amazed.

-Rivit

 

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Diesel Test Hardcore is exactly what its name says: Hardcore. Its very potent and you really have to ween yourself onto the stuff because it has such a powerful effect on your body. Be sure to drink 2-3 big glasses of water with each dose, this will help you out a lot. I have noticed that I get headaches a decent amount of the time when I take Diesel Test Hardcore but the only problem I have had is getting these headaches randomly after taking a dose they usually aren't too bad and don't last that awfully long. The benefits greatly outweigh the one little "side effect" if you want to call it that. When you take this stuff you feel great, your usually in a good mood, the product gives you a lot of energy and if you take more than two pills a day your horny as hell!!! I try to keep my dose to around 2-3 pills a day and I have had great results with pumps, great pumps, increases your NO2 production, and helps your recovery and strength slightly as well. Diesel Test Hardcore gives u that added boost in the weight room without the feeling that your on speed or something that some supplements can give. Where I have seen the most effectiveness with Diesel Test Hardcore is in the libido department, man this stuff is CRAZY. (In a good way) It makes your junk hang like you want it to, gives you rock hard and increases your erections in size slightly (really helps pump that blood in there lol), but you have to be careful cause it also seems to make you a little more ready to pop in that department, for lack of a better term. Bottom line is that this stuff gets your goods rockin and your mood elevated and helps motivate you in the gym. Try it, if nothing else. Its worth at least one try, don't be surprised if you find yourself ordering more.

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-Drew

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I stacked this supp (DIESEL TEST Hardcore) with nos ether and got strong as hell libido was off the hook, i even got better sleep at night. I would recommend this product to anyone.

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-Justin

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I try to keep my dose (DIESEL TEST Hardcore) to around 2-3 pills a day and I have had great results with pumps, great pumps, increases your NO2 production, and helps your recovery and strength slightly as well. Diesel Test Hardcore gives u that added boost in the weight room without the feeling that your on speed or something that some supplements can give. Where I have seen the most effectiveness with Diesel Test Hardcore is in the libido department, man this stuff is CRAZY. (In a good way) It makes your junk hang like you want it to, gives you rock hard and increases your erections in size slightly (really helps pump that blood in there lol), but you have to be careful cause it also seems to make you a little more ready to pop in that department, for lack of a better term. Bottom line is that this stuff gets your goods rockin and your mood elevated and helps motivate you in the gym. Try it, if nothing else. It's worth at least one try, don't be surprised if you find yourself ordering more.

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-Drew

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have been stacking this (DIESEL TEST Hardcore) with NOS PRECUSOR AND ETHER 2010. the pumps, vascularity, strength is crazy. this is the best stack i have ever used (and i used about everything out there).

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-Justin

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The last formula (DIESEL TEST fall 2007) helped increase my bench by 30lbs within a month. It was similar to the effects of a prohormone when it comes to strength. I was looking for a bit of a bump in my libido and perhaps the size of my load but there wasn't much difference there. I would strongly recommend this product to those over 30 as I believe test boosters are needed right around that point. One thing for sure, this is the best test booster out there and doesn't need to be "stacked" with anything. With that in mind it is also the most economical since you would have to stack 3 bottles of supplements at $30 a piece to have the same formula as this product.

-Robert

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“I am currently on week 3 of diesel and i am def starting to notice that I am Leaning out while keeping size. I now have visible veins on my abs and also going across my back and chest. I have 4 of my fellow state troopers taking it and they are also loving it.”
 

-Cougar10033

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- Libido was up by day 3.
- I was Feeling "On" by day 6 and that lasted well into my supplementation.
- Increased hunger
- More intensity in the gym
- Noticeable pumps
- More juice to lift heavier weights.
- More strength in my compound lifts.

Cons
- literally none.

-98gsx

day 3: “Weights felt pretty good today...better than last week no real side affects yet but dont think its kicked in yet”

day 5: “DT is kickin in now i have a 5 o clock shadow at 3”

day 6: “DT is kicking in im gettin hairer and im shootin some monster wads”

day 7: “GREAT workout...dt is kickin in the turbos now”

day 10: “Test feels way up and hair is shooting out of everywhere. the hair is growing MUCH faster than it ever has and ive never been a really   hairy  kinda guy, libido is way up, confidence is goin outta the roof and the prs (personal records) talk for themself...”

day 13: “im gettin boners like crazy now...just sittin there they just rise up at the thought of a gurl...lol”

day 20:  “Test is really up there and put it to good use the other night.”

 

-42 yr. old tester JH

 

 

 

 

Statements have not been evaluated by the FDA or Health Canada.  This product is not intended to prevent, treat or cure any disease.