Zantrex Black Review – The Best Zantrex Yet?

By: Rob Miller
42 User Reviews
 Fact Checked On: 4-18-2021
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i took the first dose of Zantrex black which is 2 pills 15min before breakfast. I experienced the flushing, but that went away. Now I'm feeling terrible nausea. When will that feeling stop? And what should I do about it? Please help. -Ashley


Zantrex pills are very strong.  Try taking one pill at a time instead of two, and make sure you drink plenty of water. If you still feel nauseous, you should discontinue use.- Rob

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What stores sell Zantrex Black? -Jennifer


You can find this supplement on the shelves of many brick and mortar stores like GNC, Walgreens, Walmart, and many others.- Rob

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I am celiac, is zantrex black gluten free? -ben


All of the ingredients within Zantrex Black are gluten free; however the manufacturer does not claim to be a gluten free facility.- Rob

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HAY YO BLOKES I TOOK 2 PILS MYSKIN FELLS LIKE FIRE BURING UP THEN IT STOPS BURING I PUT MY AC ON DRINK 1.74L.OF WATER IS OKAY OR SHOULD I JUST TAKE 1 TABLET ? 59 OZ. OF WATER DRINKG 2.63L. 89.OZ OF WATERA DAY -Sir.Quala


Cut your dose in half, take it with a meal, and make sure you continue to drink plenty of water.  If that doesn't change things, you may have to switch to something with fewer stimulants.- Rob

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I made the mistakYe of taking 2 around noon then another 2 at 6pm. It's now the next morning and I feel like I'm tripping out. My pupils are super small, I'm dizzy, nauseous, spacey, almost a hangover/very drunk like feeling making even water difficult to swallow without it trying to come back up. I slept almost not at all and had the worst heartburn last night. I've had niacin before and most all of these other ingredients. When does this drugged sick feeling go away? I only took 1 this morning thinking it might help balance what I'm feeling. -Jennifer


When you're feeling like this, discontinue use, drink plenty of water (as much as you can) and get as much rest as you can. Once you're feeling better, after a couple days, try just one pill and see how you handle it. If that works for you, stick with the one pill at a time. If not, I don't know what ingredient is causing it, but I'd say Zantrex Black isn't for you.- Rob

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Author: Rob Miller

Supplement Critique

Rob Miller founded SupplementCritique.com 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 +.

74 comments on “Zantrex Black Review – The Best Zantrex Yet?”

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  1. I was so excited to start taking Zantrex Black that I took two as soon as I got home from the store at 7:30pm. It’s 5:30am now and I’m still waiting to be tired enough to sleep.

    Don’t take this too late in the day!!
    Reply
    1. Hey Jesse,

      Yeah, I’m not surprised. There’s a lot of caffeine.

      I wouldn’t take it after early to mid afternoon if I were you. Let me know how it works out.

      Reply
  2. This is my first day using it I’m on my second dose I took two in the morning and I took two before lunch gave me lots of energy and I’m not jittery at all I will continue using it because for one I know it helps with my appetite hopefully I’ll lose some weight in the end.
    Reply
  3. I have been taking the pills for close to a month and have gained weight instead of losing weight. My input is 900 and output is 1250.

    I eat 2 small meals a day and work out atleast 5 days a week for over an hour each day.
    Reply
    1. Hi Emily,
      I think what’s happening is your stalling your weight loss by eating so little and only eating 2 times a day. I know the traditional weight loss advice is eat less calories then you burn, but what ends up happening is your body goes into starvation mode when you feed it less calories then it is used to.

      The end result is your body shuts down your metabolism, and starts storing those calories as fat.

      I would suggest you eat more meals (like 4 – 5 a day) and space them out about 2 – 3 hours apart. This will keep your body fueled and will keep your metabolism up.

      Supplements wise, you may want to check out a fat burner called Phen 375. Phen 375 works well to burn that stubborn body fat that just won’t go away, here’s my review: https://www.supplementcritique.com/phen-375-review/

      Lastly, for your convenience I’m sending you my free “How To Get Ripped Quick” eBook, as well as some bonuses. It’s packed with tips on diet and exercise that will help you along the way.

      Hope this helps and let me know if you have any questions!
      Reply
    2. Hey Emily,

      Just sent you an email.

      For anyone else looking for the free ebook, click here to sign up for your free ebook.

      Rob
      SupplementCritique.com
      Reply
  4. I have & still use Zantrex Black, I’ve lost. 19lbs within a month. Using the Fat burner.

    But my question is, does anyone know that when taking time released product like this, follow directions. When taking a fat burner like this?

    I mean come on! The guy who took this product who gave it 1 star, probably didn’t build a tolarance for the product.

    Rule of thumb,build a tolerance for it. Like Hydroxycut Black.

    For 1-3 day take 1pill 2-3X’s a day, on day 4 take 2pills twice a day with meal or when you need energy. Do not exceed. 6pills in a 24hr period.

    I use the same method taking Zantrex Black. And I’m reciting this off the top of my head.

    As long as you build a tolerance to the fat burner you’ll be fine. And if you’re used to drinking caffeine.

    But Zantrex should put in detail how to use it to build a tolerance for their product. So nobody won’t go to the ER for not following directions!

    Reply
  5. I will be starting Zantrax Black on monday! I have been doing hydroxicut and lost about 25 pounds in 3 months!

    I am struggling with the last 10 so going to switch it up!
    Will update in about a week!!
    Reply
  6. I give it 3 stars at first glance. They look scary!

    Black pill! Hope this black “magic” works for me, I’m only starting out this pm with 1 pill.

    Will stay with 1 pill 3x a day and let’s hope I can repost later with my results!!
    Reply
    1. Hey Christy,

      Skin flushing is a known side effect from Zantrex Black. It’s caused by niacin, and it’s characterized by red, hot skin.

      Other than that, I haven’t heard of it causing a rash.
      Rob
      SupplementCritique.com

      Reply
  8. Just bought the zantrex black pills and caught them on sale which is the best. So i had some questions before i started taking them.


    So how long do i have to wait to start these because im actually still taking the blue ones, my friend told me thari need to stop for a few days to get everything out my system.
    How strong are these as free as caffeine people were telling me that i will be bouncing off the walls.
    Will these help burn fat and help me lose weight

    Reply
    1. Hey Ivan,

      There’s no set time frame, but giving it a week in between should start you off with a clean slate. It’s got a whole lot of caffeine, but they don’t reveal how much.

      Definitely don’t take them if you want to go to sleep any time soon, and watch your additional caffeine intake. These will burn fat, give you energy, and suppress your appetite.


      Rob
      SupplementCritique.com
      Reply
      1. Thank you so much for the info no worries as far as the additional caffeine i gave up anything that has it no more soda or any coffee like that.
        Reply
  9. First time I’ve used, I experienced hot flashes shakes rashes. MAKE SURE YOU TAKE WITH WATER!! I took the same amout 2 pills with water had no problem.

    WATER is what you need to not have got flashes rashes and shakes
    Reply
  10. I took 2 before main mean at 3pm it is now 8am the next day and I still haven’t slept I threw up had diarrhea my heart was hurting and racing so fast I was sweating and really bad headaches right now my eyes hurt for staying awake so long my belly hurts I still have a headache and anxiety I missed work yesturday and I think I’m going to miss work today how long till this goes away how long does it take to come out my system
    Reply
    1. Hey Jessica,

      I hope you’re feeling better by now. Zantrex Black has a lot of caffeine as well as niacin.

      You could be reacting to either or both.

      Rob
      SupplementCritique.com
      Reply
  11. FYI-It has 300mg of caffeine per 2 pills. Drink plenty of water and you will be fine.

    If you dont, it will cramp you up and you wont feel good.
    Reply
  12. I want to cancel this product! My card was hit for $89.95 last month — all for a “FREE” sample!

    How do I do this?
    Reply
    1. Hey Johnnie,

      Sounds like you inadvertently signed up for a monthly subcription when ordering a free trial. They mention the subscriptin in the terms and conditions, but you usually have to work pretty hard to find it.

      What you have to do now is call the company you ordered from and tell them to cancel your subscription. Otherwise, you’ll continue to be charged each month.


      Rob
      SupplementCritique.com
      Reply
  13. Hi Rob i was just release from the hospital and i told doctor i took four of zantrex pills two in morning 15 min before meals 2 in afternoon. Only after i took the last two i started feeling discomfort so i was rushed yo hospital.

    The doctor said it was too much caffeine in my body. My question is if i followed directions why was i feeling like i was about to die…

    Reply
    1. Hey Shelly,

      Sorry to hear about what happened. You may be overly sensitive to caffeine.

      Whenever I start a new supplement, I start with a low dose, often half, for that exact reason.
      Rob
      SupplementCritique.com

      Reply
  14. I’ve been taking Zantrex Black for about a week. I don’t have any side effects and I can tell it has curbed my appetite so far no complaints.

    I would like to let people know these pills are huge so if you have hard time swallowing pills this may not be for you. It’s the biggest pill I gave ever taken. The next biggest would be 800mg Ibuprofen and it’s not as big as Zantrex

    Reply
  16. HAY YO BLOKES I BEEN TAKENING ZANTREX BLACK 3 1/2 DAYS NOW I NO MY HOLE RIGHT ARM HURTS I HAVE SHOOTING PAINE IN MY SHOULDER 2 THE TRICEP OF MY FINGERS SOME ELBOW FOR ARM A) WILL THE PAINE GOAWAY OR B) SHALL I STOP TAKNING IT IT FELLS LIKE A SHARPE PAINE IN MY SHOULDER BLADE LITTLE IN MY PECK MUSCLE OR CHEST ITS SCARES ME
    Reply
    1. Hey Buddy,

      I’m not sure what’s causing it, but stop taking it and see if it goes away. If you want to try again after a few days, lower the dose and make sure you take it with food.


      Rob
      SupplementCritique.com
      Reply
  18. I’ve read nothing but bad reviews about side effects, but I am trying this anyway. I bought 2 bottles last night, and I just took my first 2 pills.

    I have a 4 month old and I want to get rid of this extra weight I’ve gained during pregnancy and I also desperately need energy. Hope this works !!!

    Reply
  19. Im on day four takin these. Ive only takin them once to twice a day thus far, ive had no side effects, no flushing .

    I have found tjat as long as u eat something shortly after takun, u wont get stomach cramps
    i have toddler twins, and the boost of energy ive gotten from them, has made it easier to maintain with them. My appetite has become more and more controlled by the day.

    I feel lighter on my feet. Im going to continue this for 25 days.. will rerate after..

    Reply
  21. Same here I have been taking the black for about6 weeks and felt a little bit of upset stomach before while taking this pill but nothing too bad and even lost a few pounds but yesterday I took some before work and my head face and arms turned blood shot red hot to the touch and felt like I was on fire It went away after about an hour but it scared me enough to not take it again which is sad cause it dose help with weight loss but at what cost ? And I have ialways taken energy suplments so the senitivity to the caffeine wasn’t a factor

    Reply
    1. Hey Ashley,

      That’s strange that it didn’t happen until 6 weeks in. I wonder if there was an interaction with something else you took.


      Rob
      SupplementCritique.com
      Reply
  22. For everyone that experiences “flushing” when taking niacin. Having high cholesterol and being prescribed niacin amongst other things by my doc, I had experienced flushing of the face and arms kind of like a rash.

    I asked him about it and this is what he told me. Take a children’s aspirin about 20-30 mins before taking the niacin and I shouldn’t experience the side effects of taking so much vitamin B.

    Sure enough, I had taken a low dose children’s aspirin beforehand and didn’t break out with the rash associated with taking “no flush” vitamin B. Like I said before, my doc is the one that gave me this little tidbit so try it on your own if you want.

    Thx! Frank White, Albuquerque

    Reply
  23. I’ve been on black for about 5 days lots of energy mood changed alot for good but still haven’t lost any weight and other one I can buy from a store that will work
    Reply
    1. Hey Stephanie,

      Weight loss supplements are tough to quantify. One will work well for some people, while not at all for others. It sounds like this one may actually be working. Have you checked your calories intake vs output. It’s very important that you use diet and exercise to strike the right balance. You can use our calorie calculator to help figure out how much you should be eating.

      Rob
      SupplementCritique.com
      Reply
        1. Hey Stephanie,

          Well if you’re eating 600 calories more than you’re using, you’ll gain weight. Though your body should be using more than 600 calories just living life. I suggest you sign up for my free “weight loss” ebook. It lays out a great plan you can use to lose the weight you want.

          Rob
          SupplementCritique.com
          Reply
  24. i have been taking these pills for 2 days now. yesterday i took the total of 4 and i can tell you now i have threw up once. i felt like my heart was about to come out my chest and was not able to sleep. after i threw up i felt a little better i have taken just one pill today and i feel like it just gave me the right amount of energy i have ate only once and havent had the desire to eat again. it has made me extremely thirsty and it is now 6pm and im about to eat a salad. so how long will i have the side effects for?
    Reply
    1. Hey Rosie,

      It really depends on a lot of things, but probably when you wake up tomorrow, you’ll be fine. Stick with just the one pill, and if you still don’t feel right, you should discontinue use.


      Rob
      SupplementCritique.com
      Reply
  25. I fell nothing, no good nor bad. I got this hopping for extream results even with bad sideffects.

    Any suggestions?
    Reply
    1. Hey Sara,

      It’s unusual to have absolutely no effect, so it sounds like Zantrex Black just isn’t for you. It happens. Sometimes, a supplement that works well for almost everybody just doesn’t work for you. Sounds like it’s time for a change. Try Instant Knockout instead.

      Rob
      SupplementCritique.com
      Reply
  26. First day trying the Zantex black. I was full of energy; I felt like I could run miles, but haven’t got back into my workout routine yet.

    I haven’t been able to go to the gym for almost two months! I had personal stuff going on where I had to eat out a lot and gained weight.

    I am hoping I can take this pill until I can get to my goal weight and get my body back on track. I’ll keep you posted on results within the week and month.

    With fat burning and weight loss; what does the Zantrex black do to your body? Will it burn the fat and tighten/tone those areas?

    I really want to loose the fat in my stomach, thighs, and bottom; I didn’t know if this will help shrink those areas as it burns the fat and looses the weight.
    Thank you, Ill keep you posted how it goes.
    Reply
    1. Hey Valerie,

      As a fat burner, it increases your metabolism, encouraging your body to use stored fat for energy. It also decreases your appetite.

      But it doesn’t do anything to tighten or tone your body. You’ll have to do some exercise for that.

      Looking forward to hearing how it goes.
      Rob
      SupplementCritique.com

      Reply
  27. Hi Rob

    I have a question for you, I tried the red bottle at first at the end of 2011 which was effective but a bit crazy so I switched the blue bottle and have been taking it for the last 3.5 years, had excellent results – within the first year I had lost 10/12 pounds, I went from 142 to 129 and kept it off for over two years. I started getting a little bigger last summer so I switched to the black bottle briefly when it came out but found it made me hungrier – I might give it another go and see if I have a better time with it

    Basically I’ve gained all the weight I lost back in the last 8 months!!

    Can you recommend something for me that is similar or more effective than zantrex?

    I think the blue bottle has run its course and has stopped working for me as my body has become used to it. It used to be so effective for me and I would lose weight or maintain just by eating healthy and taking the blue bottle.

    I didn’t need to do extra exercise.

    Can you suggest a zantrex product or even another product that it going to make a difference when I am so accustomed to supplements now?

    Thanks
    Reply
    1. Hey Emma,

      Developing a tolerance is pretty typical with supplements. Sometimes all you need is a short break, but you could need more. Go with Instant Knockout. It’s a great fat burner/appetite suppressant. It also provides energy, which is good because you probably should add some exercise to your routine for better results. If it works for you, stick with it a while, then try the Blue Bottle again and see if it works again.

      Rob
      SupplementCritique.com
      Reply
        1. Hey Emma,

          No, not at all. It’s a fat burner, so it’s for weight loss.

          It doesn’t have any ingredients that will bulk you up.
          Rob
          SupplementCritique.com

          Reply
  28. I have been taking the black for almost a week now and the only change i have seen is the third day i drank coffee and broke t in hives but no weight loss and I’m still snacking!!!!i just want my stomach to go back o being thin like it was prebaby!!!!! How long till i see results?

    Btw im takong 4 a day with my meals
    Reply
    1. Hey Billie,

      What I’ve found with fat burners is that if they don’t work by the first few days, they probably won’t. I wouldn’t worry, it happens. Not every supplement works for everybody. Check out Instant Knockout. It’s my number one pick.

      Rob
      SupplementCritique.com
      Reply
  30. I was taking the black pill for about two days and I felt very nauseous. I last took the pill 3 days ago but I’m still sick with no appetite.

    How long does this last? I’ve taken the red pill b4 and I liked that much better.

    Black pill is horrible
    Reply
    1. Hey Arielle,

      The effects probably shouldn’t last as long as they have. If you don’t feel better by tomorrow, you might want to consult your doctor.


      Rob
      SupplementCritique.com
      Reply
  31. I know the pill says to take them before meals but I get really nauseated almost to the point of vomiting so I started taking it with my meal. I have seen a change and I am planning on upping back to the 2 pill dose instead of just the one I have been taking.

    Reply
    1. Hey Athena,

      Yeah, I adjust my dosing and timing pretty often. It’s good to pay attention to how your body responds and to be wiling to make changes when necessary.
      Rob
      SupplementCritique.com

      Reply
      1. I uped my dose today to the two pills after having eaten and I did just fine on it. So I think once I have something in my stomach I will start taking the two.

        I have noticed the weight lose already so it is working. And I am not nauseated.

        Reply
          1. I sent you a letter for a job and,the more I read all your reviews are so great. Meaning everything you review seems to be a great product.

            That screams screams sponsored to me. Also, how can you give a good review to a product that doesn’t give the exact amount of any ingredients especially caffeine also Ilst 75 pounds with NO fat burners or pre workout crap.

            I’m at a lower weight now and, being this industry is so dirty I am testing stuff out on my own. BSN I will be doing.

            This product that u claim is great is filled with crud. Let’s keep it real here.

            There are different names but they equal one word caffeine. Also when u stop it u will gain all what little weight you lost.

            PEOPLE LISTEN TO ME PLEASE I TAKE THIS TO HEART AND CARE YOU DO NOT NEED THIS TO LOOSE WEIGHT
          2. Hey there,

            It doesn’t sound like you’ve read this review or many of the hundreds of reviews on this website. I don’t claim that Zantrex Black is great.

            I rated it as average and recommend that because of the large dose of caffeine, it should only be used short terms.
            Rob
            SupplementCritique.com

    2. Im almost 100% the box says to take with meal or 15 min before, reason being is that it takes about 30 min before the food gets to the stomach. Hope that helps.

      However I have seen a both positive and negative effect I do not know which way to go. I bought the black.

      Reply
  32. I have never taken the red but I have been taking the blue for some time now and love them I wanted to try the black ones so I did and 5 mins into it Istomach started burning and I broke out in a rash all over after it went away I had alot of energy I have read its the niacin in it that does it I’m going to try again and if it brakes me out again I’m going back to the blue
    Reply
    1. Hey Melissa,

      Yeah, niacin will make you flushed, but it shouldn’t last very long. The blue is definitely the one with the least side effects.


      Rob
      SupplementCritique.com
      Reply
  33. Love this zantrex black. Ive never tried the other two.

    My husband got this for me and i can now after one month of taking them get back into jeans my thighs wouldnt let me in before. Im loving them and will continue until i reach my desired size.

    I will keep you posted.
    Reply
  34. Ive been using the blue.pill and it does wonders for me. I juat started tge black ones and my appetiteis nearly gone.

    In all ive lost 48 lbs and am looking forward to dropping another 40 or 50 lbs. This is a great product when used correctly.
    Reply
  35. I’ve been taking black Zantrex for 5 days started having my period after 18 months of not having it . Gives me crazy energy , feeling my hands shaking lost of appetite.

    Still don’t know if I will be able to handle it !!!!!!
    Reply
  36. I love zantrex black works great.I have lost 52lbs on it since august.I’m unable to do a lot of.excersise due to health issues but I do watch what I eat.its like the weight has just melted off me.I no longer feel the need to eat takes my appitiete away.no side effects either like other weight loss pills.if your skeptical don’t be its amazing!!
    Reply
  37. I have tried all three, I am on my first bottle of black. I like the morning boost, I take it at 5.30 a.m. then one at 12 noon and 2 at 4 p.m. by 2 p.m. I am so beat and tired even with 2 cans of pop sometimes 3 cans of pop I still want to go to sleep .

    So I must be different from everyone else, I do get the upset stomach but it keeps me from eating, so its ok .
    Reply
  38. First off, love the previous comment as it made me laugh.

    I’ve been taking Blue off and on as I work nights and it’s amazing at keeping the energy up and munching on food down.

    So far, the Black has been great as I love the quick energy hit that i get from it. I take it at 6pm when I get up and then again at 12:30am when I take a quick lunch.

    This burst of energy helps me stay focused and awake until I’m done at 6am. I still have enough energy for a quick run or bike ride in the morning and then I sleep great when I head to bed around 10am.
    The downside is the occasional jitters.

    I love my coffee and I’ve switched over to Decaf so that I don’t overload my heart.

    I would consider switching back to Blue when I’m done with this bottle of Black, but I haven’t quite decided yet. About 40 pills left to go.

    Reply
  39. I have used all 3 products and I love them! I only found a few problems with the red pill and that was that after taking it awhile it altered my mood to the point if being angry and I had a lot of melt downs while taking it.

    When I finished the red I started the blue pill. My ABSOLUTE FAVORITE!! I call it my mega super happy pill!! If u want sunshine and rainbows laces with unicorns: blue bottle is for u!

    Lots of high energy, little to no jitter, no headaches, still suppresses appetite and no hard crashes. This is my go to pill for long days at work.

    Even with just under 5 hours if sleep still makes happy!! Love the blue pill. Now zantrex black is a little different.

    It gives me energy but it’s a mellow energy. I don’t feel like I wanna blow up the world nor do I feel like I’ve been swimming in glitter while in a tutu.

    It’s just mellow. Lots of jitters tho IF u take it with caffeine like I do.

    I like it but the blue bottle is by far my favorite and after the black i will definitely go back to the blue bottle!! LOVE the blue bottle!!!!!
    Reply

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