Black 4K Review – Does It Work?

By: Rob Miller
3 User Reviews
Fact Checked On: 3-27-2020


Black 4K vs Black 3K
Is Black 4K Better Than Black 3K
Is Black 4K Safe
My Personal Results
Where to Buy
Pros and Cons
User Reviews

When most guys start thinking about using a male performance enhancing supplement, they’re looking for something that works like Viagra – quickly and effectively.

They don’t want to have to remember to take a pill every day like it’s medicine.

They just want to pop a pill or two when the time is right and know that they’ll be legendary.

That’s what Black 4K claims to do for you.It’s the newest in a long line of supplements from the Rhino brand (at least I think it’s the newest – it can be hard to keep up).

And that brings up a valid question – if any of these products worked, why would the company keep replacing the old versions with new versions?

If it worked, wouldn’t they just stick with it? Well, maybe.

I’ve looked into it and I think I have the answer, but we’ll get to that in due time.

First, lets take a look directly at Black 4K and see what it can and cannot do.

Click Here
to jump to my personal review.

Black 4K Benefits

Like we mentioned up above, Black 4K is a take-as-needed male performance enhancement supplement.

You don’t need to take it every day, just one pill about an hour before you’re ready to have sex.

What happens is you’ll:

  • Achieve your erection practically at will.
  • See your hardest, thickest, longest erections ever.
  • Last longer than you thought possible.
  • Have zero concerns about premature ejaculation.
  • Explode in the end with massive amounts of ejaculate.

And it claims to do all of this using a completely herbal formula that we’ll take a look at now.

Black 4K Ingredients

The ingredients in Black 4K are all listed in a proprietary formula on the product packaging.The fact that it’s proprietary means that they’ll tell you what ingredients make up the formula, but they won’t tell you how much of each there is.

Here’s the list they provide:

  • Goji Extract
  • Deng Sen Extract
  • Atractylodes
  • Cinnamon Bark
  • Dismutase
  • Cornus
  • Cuscuta
  • Dang Gui
  • Licorice
  • Condonopsis
  • Cordyceps Sinensus
  • Rubus
  • Panax Ginseng
  • Pueraria Lobata
  • Superoxide Dismutase
  • Vitamin B12

Click Here to see a picture of the label.

There are only a couple of familiar ingredients in the list, including Goji Berries, Panax Ginseng, and Vitamin B12, which may all be decent supporting ingredients in a strong formula, but can’t carry one on their backs. Goji Berries are an aphrodisiac.

Ginseng provides energy and some libido support.

And Vitamin B12 gives you lasting energy.

Again, all good components, but not enough to make a very effective formula on their own.

A little research into the others shows that Dang Gui supports healthy blood flow and Condonopsis is an energy booster.

But on the other hand, Licorice and Rubus should not be used as sexual enhancements for men. Licorice can lower your libido, and Rubus has an estrogenic effect, so we’re not sure what these two are doing in the mix.

All in all, I’d say the formula looks quite weak.

If it works like they say, I would be surprised.

I have some on order, so after I check it out, I’ll come back and post my results.

Black 4K Review Black 3KBlack 4K vs Black 3K

We did a review for Black 3K, the previous version of Black 4K, and surprisingly there’s very little difference between the formulas. The only difference I could find is that Black 4K contains Vitamin B12, whereas Black 3K left that out.

Black 4K Reviews

For a new product, there are lots of customer reviews posted on, where the range of opinion varies a great deal, and it’s a relatively even split.

A large percentage of reviewers give Black 4K 5 stars, but an almost as large percentage give it only 1 star.

The rest fall somewhere in between.

A typical 5-Star Review looks something like this one from “Amazon Customer”:

“Wow this stuff really works.

One capsule lasted over seven days….


The typical 1-star review basically states that Black 4K just doesn’t work, but they often compare their results to Black 3K:

“I’ve bought 3K before, That worked wonders, Not sure whether this is counterfeit garbage or 4K sucks overall, but this stuff does absolutely nothing”.

“I had tried the Black 3K before and had great results, Don’t really know what the difference in the two are”.

Is Black 4K Better Than Black 3K?

As far as we can tell, Black 4K and Black 3K have almost the exact same stated formula, the only difference being a little Vitamin B12. Of course, they may have played with amounts, and since we don’t have that information, we don’t know, but I have a different theory.

Rhino male enhancement products frequently get recalled when the FDA discovers that they contain undisclosed ingredients – most often and most notably Sildenafil, the active ingredient in Viagra.

It’s something that a lot of these fast acting enhancements do.

They inject a little of the stuff that works into each pill without letting anyone know (because it’s illegal), then they pass themselves off as all natural so they can sell it over the counter.

It’s sort of a double-edged sword.

Now all of a sudden the product works, but it’s no longer an herbal supplement and it could potentially be dangerous for some guys to use.

If you take heart medication or blood pressure medication, you should stay away from Viagra, and by extension, Rhino products.

Even if you don’t have a heart condition, do you want to trust a company and take their pill when you know they’ve been dishonest about their ingredients several times in the past?

Is Black 4K Safe?

Usually, it’s fairly easy to spot potential offenders.

Customers who’ve used it will complain of headaches, stuffy noses, and racing heartbeats.

These are common side effects from Viagra.

If you see feedback about a “natural enhancement supplement” and they mention these, it’s a pretty good sign that there are undisclosed ingredients involved.

The “good” news is the Black 4K feedback doesn’t say this at all.

Instead, they just say it doesn’t work, which leads me to believe it doesn’t have the Sildenafil in it (at least not yet).

Since it’s a Rhino product and they get so much attention, I’m planning to test this one myself.

I’ve used Viagra before, and I’ve taken pill that turned out to be more than just supplements in the end, so I know what to look for and will be able to tell you whether or not Black 4K is on the up and up or just as shady as the other Rhino supplements.

My Personal Results

black 4k reviewI finally got a chance to try out Black 4K, and I have to say I’m quite impressed. It’s not the best fast acting male enhancement pill I’ve used (click here to see that one), but it seemed to get the job done.

For me, it seemed to start working in about 30 min., and the effects were pretty good. I experienced relatively rock hard erections, and it definitely gave me a marked improvement in libido.

One thing I did notice was one of the side effects I got from it was a REALLY bad headache. I can’t be absolutely certain that Black 4K was responsible for it, but I didn’t take anything else that day and I don’t normally suffer from random headaches.

Another random thing I seemed to notice was it made me tired. I’m not completely sure that Black 4K was the culprit, but I was in bed about 1 hour before I normally would be that night.

Update 12/23: Black 4K Contains Hidden Ingredient

It’s been a long time since I’ve done a follow up review for Black 4K, but I just so happened to come across the FDA website and found out that they’re actually putting an illegal ingredient into their supposed all natural formula.

It’s called Sildenafil, and it’s the active ingredient in prescription ED medications.

This would explain why it works as well as they say it does, and also explains why I got a headache from taking it.


Where to Buy

Black 4K is available online through a bunch of different retailers, and I know some of them sell to convenience stores and sex shops, so you might be able to find some out in the world too.

It’s sold in single packs for around $8 a pill, including on around for your best price.

Black 4K Pros and Cons

Advantages of Black 4K

  • You don’t have to take it every day.
  • The ingredients appear to be all natural.
  • Since you buy it in single packs, it doesn’t cost very much to try.

Disadvantages of Black 4K

  • Black 4K reviews are not very promising as far as how effective it is.
  • It’s made by Rhino, which is making quite a name for itself in the business of trying to sell medication as supplements.


At this point, it looks like Black 4K is indeed all natural, but that it doesn’t work as advertised.

In the end, the reason Rhino puts undisclosed ingredients in their formulas is because they work, and people are willing to risk the potential side effects for the potential success.

And without the prescription medication, a fast acting herbal formulation doesn’t have much of a shot.

It has its merits and definitely has benefited me in certain areas that I am grateful for, but nonetheless, I would only recommend trying it if you have some wiggle room to experiment around with various male enhancement supplements as there are better ones available that are more proven.

Some of their practices make me even more iffy on them, but provided that what you are getting is what they say it is, it should be pretty effective in some regards.

Since personally testing it, I agree, it actually does work.

However, the fact that they MIGHT be putting illegal ingredients in it knocks down my overall rating quite a bit.

Have You Used Black 4K?

Leave Your Review Below!

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User Reviews

Have you used this supplement?

Julian's Review

By Julian,  Mar 18, 2017

I took one 4k and my status from a being a bottom went out the window. I lasted hours and the multiples of ejaculations I had were limitlessly intense aka yes the supplement works-yes your manhood will be given a new definition-yes your semen supply is never ending!

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8 out of 9 people found this review helpful.

Lenwood johnson's Review

By Lenwood johnson,  Mar 25, 2017

I Just tried the Black 4K and I was Surprised. Took 1 pill waited for 1hr and the rest was history.  Harder and Thicker. I guess like all meds it effects people differently, but Works Like Hell for me.

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7 out of 8 people found this review helpful.

Not now

By Jasper,  Nov 26, 2018
In Short: I would NOT recommend this to a friend.

I tried Black 4K only once at the request of my friend who sells it and was getting complaints from his customers. I followed my usual procedure and waited until all similar substances were eliminated from my body.  I took it in the morning on an empty stomach. After about ten minutes I was slightly edgy; (caffeine?) after twenty I had mild stomach upset and nausea, but nothing major and that effect was gone after 40 minutes.  Other than that, absolutely nothing. Usually I feel the effect of a sex enhancer first in my sinus cavities and sometimes a mild light-headedness or euphoria, this time nothing.  I know that feeling in the big head well as it is most pronounced when I take troches containing 5 mg of tadalafil. On any kind of sex enhancer that works I feel the feeling in the big head after ten or fifteen minutes; normally it takes another ten to twenty minutes to get to the little head.  This time with the Black 4K nothing, not even a slight twitch or tingle in my best six. I never took the Black 3K so can't vouch for its efficacy or lack thereof.  I do know the feeling of the big three, Cialis, Levitra, and Viagra. Black 4K was nothing like that.  Some of my friends customers, but only a minority reported a feeling of being extra tired after both Black 3K and 4K. The tiredness reflects results of tadalafil, the active ingredient in Cialis, not sildenafil.  That's one way I detect the presence of tadalafil as an unlisted but very active ingredient in over-the-counter sex enhancements. Tadalafil usually takes a little more out of me and results in tiredness I don't feel with sildenafil.  Could be the Rhino folks were using both sildenafil and tadalafil in different lots of their product, wouldn't be the first time.
Before I took the Black 4K I stimulated my penis to erection three times. No I did not have a partner because truthfully I didn't expect the stuff to work and I was right.  She would have said, "You know damn well I came over here for something besides breakfast!" My average time to full erection was two minutes forty-three seconds, which is actually a little long for me, but again I had eliminated any sex enhancing supplements and pharmaceuticals from my system and I wasn't particularly horny. Following this trial I took the Black 4K and waited.  At different intervals over the next hour my time to fully erect my penis was over three minutes, even longer than without the Black "help." Yeah guys, this is another case of, "The old one worked, likely because it was tainted. The new one don't, doesn't, won't.  Don't bother." If you're a fan of the Rhino products, wait until the next new one comes out and try that. Don't get carried away, it may or may not be safe.

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0 out of 1 people found this review helpful.

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User Questions and Answers

Hi, I have 2 questions.  1- Can I take Black 4K with Alcohol and 2- Can I take Balck 4K before 2 or 3 hours before sex?  Thanks. -ASAAD

Alcohol in moderation shouldn't be a problem, and 2 or 3 hours before sex is probably fine. You want to shoot for an hour before, but 2-3 hours should work just fine.- Rob

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7 out of 8 people found this question helpful.

Can you take Black 4K daily? -Joe

If it truly doesn't contain undisclosed ingredients, then it would be safe to take daily. But at $8 a pill, I wouldn't recommend it.  If you're looking for a pill to take daily, the best is VigRx Plus.- Rob

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4 out of 5 people found this question helpful.

Hi there, I have been buying black 3 k it was so beautiful, recently your company changed the presentation to Black 4K . The store employee told me the formula is the same one, that's not true, your company changed the formula too . Before I had a good performance, and now with black 4K nothing happens , I have 63 year old . With black 3k my performance was 4 days as a bull. Did you changed that? -Carlos is a review website. We are not affiliated with Black 4K or Rhino. You'll need to contact them directly. This is the phone number I found:  (818) 798-5557.- Rob

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3 out of 3 people found this question helpful.

How many days does bl4ck 4 last? -Dwayne

They don't say. I would say several hours.- Rob

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3 out of 3 people found this question helpful.

Should i take this before eating or after? -Larry

They don't specify. It's likely best to take it with a light meal.- Rob

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4 out of 6 people found this question helpful.

I took black 4k a week ago my whole face and mouth hurts and I have a headache... what I need to do..thank you -Faisal

Discontinue use and see a doctor.- Rob

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Why does it make your penis feel heavy? -Shelly

I haven't heard of it having this effect, though I admit I'm not sure what you mean by heavy.- Rob

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It's my first time ever trying this. Will this give me an erection on its own; without stimulation? -Gus

No, you would require stimulation to get an erection.- Rob

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Would the effects be stronger if I took one 3 hours prior to activity and another right before or even during? -Marty

The effects should be stronger, but it's tough to say if it would be safe. Try just one at first. Then if you feel nothing, the next time, try taking the second pill a few hours after the first.- Rob

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Bk 4 did not work can i take two at the same time -isaiah

If you felt nothing at all when taking one pill (no positive or negative effects) then you should be fine taking two. I recommend you take your dose with food to minimize potential side effects.- Rob

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Author: Rob Miller

Supplement Critique

Rob Miller founded over 7 years ago, and has been the chief editor ever since. He has a diploma in Advanced Dietary Supplements Advisor, and worked at GNC for 3 years. He KNOWS supplements, both inside and out. Rob currently resides in Jupiter, FL, with his wife of 4 years.  Learn more about him in his Bio here. Follow him on Twitter , Facebook, LinkedIn, or find him on Google +.

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