GNC X12™ Review

GNC X12™ Fat Burner - Will X12 Really Burn Fat?

X12 is the latest fat burner from the supplement powerhouse GNC. Everyone loves to over-hype their fat burners and GNC is no different. Here is what GNC says about X12:

"12 times more calorie burning after your workout"

"Burn 278 more calories with X12 and exercise"

"Clinically Researched"

The calorie burning properties of X12 is nothing to get excited about since a majority of fat burners boast the same results or better.

When a company throws in the term 'clincially proven' it is a huge marketing tactic. X12 is not clinically proven, no research was done on X12, but research was done on a few of the ingredients. And as the case in most of these clinical studies, the amount used in the study is way more than is included in a serving of X12.

Take a look at X12's ingredients:

Supplement Facts
Serving Size 1 Capsule
Servings Per Container 45

Amount Per Serving	% Daily Value

Niacin (B3)	20mg	†
Proprietary Thermogenic Blend 238.34 mg

Caffeine Anhydrous

Capsimax

Capsicum Fruit Extract

Bioperine Black Pepper Extract

A little black pepper, some red pepper and caffeine. Pretty spicy right? Overall, GNC's X12 is a pretty generic fat burner which sells at a premium price. If you are looking for a serious fat burner, take look at some of our other reviews.

Our Recommendation

Fenphedra is a better, more powerful alternative to GNCs X-12 . The extracts in Fenphedra are the best of the best. Fenphedra users have not reported any of the same side effects as users of X-12. More importantly Fenphedra users are burning fat and it is backed by a satisfaction guarantee!

Read our Fenphedra Review, or visit Fenphedra.com for more information!

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GNC X-12 review

i've been takin this pill already for the last 3 days..when i take it after 10 min i have a strong pain in my stomach. that pain grew longer every day. today i can't move. i guess its all the caffine. they said it's like 2 large cups of coffie. that is a massive amount of caffine..oh..and if you think about food after you take it..don't that pain comes back and stays so i basically forget about food for 4 hours..iv'e lost 2 pounds so far woo hoo...

#1 - breanna - 03/02/2008 - 18:23

GNC X-12 review 3/7/08

I have now taken x12 for a week and have had no results... Thats right not a pound I got x12 to just to help a little on my off workout days..I did not hink that this was a new pill that would help me drop twenty pounds in a week.. All this has doine is caused stomach cramps three out of the seven times that I took it.. I have a very strong tolerance to caffine and have used many diffrent supplements and none made me feel as bad as x12... My advice would be to stay away but if you still want to give it a chance take in the AM with your first meal that seems to be the best if you want to avoid the cramps...Hope this helps

#2 - merf man - 03/07/2008 - 16:21

GNC X12 Review

Yeah, I get teh stomach pains as well when it "kicks in", but I take the pill about 30 mins before my workout, which is always in the AM about, 45 mins after I get up.

I do drink water between sets & the pain, really not that bad guys, immediatly goes away.

I have done nothing different aside from take the pill as described & I have lost 7 lbs in 3 weeks, not bad.

#3 - B_N - 03/08/2008 - 16:47

GNC X-12 review 3/11/08

Judging by the two other reviews thus far, I thought it was just me experiencing the stomach pains (enough to not think about food as well). I start to get the pains about 10-15 minutes into my cardio workout - I have an extremely high tolerance for caffeine especially for an 1l0lb person (at 5'5" inches tall) and I felt this inhibited my endurance overall. I've been able to tolerate 25mg of ephedra the same way (or sometimes even better especially when I work out). I've been using X-12 for only a few days now, and I think it's only fair to give it a full blown month test. I have found it suppresses the appetite and have seen the scale drop a couple of pounds already!

#4 - Sasha - 03/11/2008 - 22:43

stomach pains gnc x 12

I also experience the stomach pains and have a very high tolerance for caffeine, so that has nothing to do with it. About 15 min after I take it, pain, cramps, sick to my stomach..... I don't think this could be good..... No more X-12 for me...

#5 - Nancy - 03/12/2008 - 20:01

Stomach pain after seven minutes

I've been taking this pill for the last five days and experienced a sharp pain in my stomach...so bad that I stopped what I was doing at that time. The pain lasts for about seven minutes. The pain definitely curbs your appetite! I'm returning the bottle today!

#6 - Priya Reddy - 03/14/2008 - 12:58

Itchy Redness & Stomach Pain

About three minutes after I took this I developed itchy red blotches on my hands, face and arms. I also had extreme stomach pains but the pain only lasted for a few minutes. This is the first time I've taken it.

#7 - Molly - 03/18/2008 - 18:18

Acid Reflux after taking 1 pill

I thought I would give the x12 a try so I bought it from the GNC. After taking 1 pill, it did suppress my appetite for awhile. But I am sorry I took it because it gave me acid reflux that night. It must have been all of the caffiene that is in the product. I was up for several hours in the morning suffering with severe heartburn. If you stomach is not sensitive to caffience then I say take it, otherwise you shouldn't. I don't want to see you get sick like I did. It may have been the black and pepper extract also. I have taken other products with caffiene and never a problem before. Well good luck.

#8 - Laurie - 03/19/2008 - 06:29

Chest Pains

Ive been taking X12 now for about 4 days and each time I take it I start feeling really bad.I get chest pains really bad. I think something is definately wrong with this pill. I diid lose about 3lbs in 4 days but I workout every single day. I'm scared to continue taking the pill and I'm returning it to the store(GNC)for something less harsh on the body.

#9 - Pancy Jones - 03/19/2008 - 11:13

No stomach pain for me...

I've taken x12 about six times now and can honestly say that I haven't had any of the stomach pain that others have mentioned. So far my routine has been to take it with a full bottle (20 oz.) of water 20 minutes before I work out. Maybe it was a placebo effect, but I felt really good during and after my 16 mile run this past Saturday. I've also felt better during shorter runs (8-10 miles). I guess I'll finish the bottle (it was kind of expensive) and then decide whether or not to stick with it.

#10 - S Girl - 03/25/2008 - 09:47

GNC X-12 Causes Stomach Pains

I just started taking this so I cannot review how well it works. However reading the comments I wanted to mention the stomach pains. I did get some discomfort when taking the pill. I think it is the capsicum fruit extract and black pepper extract. Capsium is the thing that gives peppers their heat. The feeling I got from taking this pill is the same as when I have taken cayenne pills in the past. If the feeling gets uncomfortable, try a glass of milk or some yogurt. That should lessen the pain.

#11 - Nezha - 04/05/2008 - 21:31

Like most of the others who commented, I experienced stomach cramps every day. I followed the instructions only did a lot MORE exercise. At the end of one week...I GAINED 2 pounds!! :( Very disappointing!

#12 - Rose - 04/07/2008 - 15:38

gnc x-12

I have taken X12 for two days and the stomach pains are unbarable. I wish I had read the reviews before purchasing X12. I am certainly going to return this bottle today because I am afraid of serious side effects later. Good luck to those of you who continue to take X12.

#13 - Regina - 04/08/2008 - 08:19

effective but stomach,,,

after i took this pill i felt buring my whole body.
i sweat more but,,, sometimes my stomuach burnt togather,,T..T it was really painful, so should eat something to relife the pain...
but i bought 2 bottles ,.. stupid choice~!!!!

#14 - took 30pills - 04/11/2008 - 07:40

GNC X-12

I've taken X12 for the past 5 days and have become concerned about the stomach pains I've been feeling. I was fine the first time I took the product but the pain steadily increased each day I took it. For me, the stomach pain lasts only for about an hour or two but it prevents me from accomplishing a good workout. I went online to see if anyone else experienced the same pain and was amazed to find out how many others did. I guess GNC needs to make a buffer of some sort for this product.

#15 - Ingrid - 04/11/2008 - 09:46

GNC X-12

I have been taking in for about 5 days..and I have really bad tummy aches,but after I use the restroom it's better and then I can go for my work-out. I will have to find out what causes the stomach pains..I don't think it's the caffine

#16 - MP - 04/12/2008 - 22:39

X12

awful stomach pain, returning bottle.

#17 - LISA HOLDREN - 05/12/2008 - 12:47

Stomach pain

I too just started the X12 and experienced the stomach pain. It was enough to stop the workout but went away after 30 min. I will continue to take it but I will take only half of the dose to begin with and see what happens.

#18 - emd52764@yahoo.com - 05/14/2008 - 22:46

X12

I also had stomach pains but my tolerance to caffeine is low. The pain was enough to prevent me from working out but the pain subsided in 30 min. I will take only half the dose and see if that improves things.

#19 - Ellyn - 05/14/2008 - 22:49

Stomach pain and GNCX12

I too have been taking GNC X12 and I thought at first because I ate a light breakfast that I was developing stomach cramps but know I now that others are feeling the same pain as I and oc course like others the pain goes away. I don't know if I should take it anymore or keep going to lose the weight. Gosh and the GNC salesman sold it to me even when i asked are there any side effects

#20 - Sara - 05/16/2008 - 10:59

GNC X12

Today, I purchased the GNC X12 along with the Body Toner Censor Supports Fat loss. Within 40 minutes of taking X12, my stomach grew HOT. Within 3 minutes, I was getting cramps and a very discomfort feeling. I felt much better after drinking two tall glasses of water. The burning and cramping went away. I will give this product another try. I am not about to give this product up just yet. Overall - my stomach pain lasted only about no more than 6-8 minutes.

#21 - Linda - 05/21/2008 - 18:43

Horrible!

This is my second day taking X12 and I just had a horrible experience. I had a sudden hot feeling in my face so I went to the restroom at work to try and 'deal'. Then I went to the bathroom and my stool was neon GREEN! EW. I couldn't believe it. Then suddenly I felt nauseous but only threw up mucous and I also got a really sharp pain in my stomach. This was followed by a very violent sweat! I was drenched from head to toe and thought I was going to die.

After about 15 minutes, I was feeling good enough to wash up and step outside. I grabbed a bottle of water and now am much better.

Needless to say, I'm returning the bottle ASAP!! I'm SO mad!!

#22 - Jill - 05/29/2008 - 08:35

GNC X12

SO this is my first day taking it. I really did not want to take all the caffeine but I decided to try it. Now, I keep hearing all of the problems with the cramping I've had none however, I have to ask are all of you taking this pill with at least a bottle of water? Even though I wasn't instructed to do so I figured becasue fo the cellulose that if would ne a lubricant to prevent cramping. Please if any one has taken this with a full glass of water and still had the cramps post here. I really do not want to continue taking something that will harm me.

#23 - Joli - 05/29/2008 - 17:36

GNC X12 .......Stomach Pains

I have had the same problem regarding stomach pains with the X12 pills. The first time i thought I was going to have to go to the hospital, it was awfull. I tried it again with a whole bottle of water and I still got stomach pains. Although not as intense as the first time when I only drank about 8 oz of water with it. This product is going back to GNC it is not worth the money or pain.

#24 - Drake - 05/31/2008 - 02:57

Worst Cramps

So I went to GNC and asked the associate which is the best diet pill out there. She mentioned the X12 pill... I was skeptical at first because I wasn't sure how it would make me feel... but NOW I am experiencing the worst pain ever. Everytime I get up, it's a sharp pain that makes me feel like I'm gong to have heartburn. I'm returning this product today. I can't handle it.

#25 - laura - 06/03/2008 - 10:12

Worst Cramps

So I went to GNC and asked the associate which is the best diet pill out there. She mentioned the X12 pill... I was skeptical at first because I wasn\'t sure how it would make me feel... but NOW I am experiencing the worst pain ever. Everytime I get up, it\'s a sharp pain that makes me feel like I\'m gong to have heartburn. I\'m returning this product today. I can\'t handle it.

#26 - laura - 06/03/2008 - 10:27

Regarding Redness/Itching of Skin after X12

X12 has an ingredient called Niacin which is one of the B vitamins and has a part in the metabolism of carbs, fat and protein. It is typically used for decreasing triglyceride levels in the blood, but it also releases prostaglandins, which have been shown to be the culprit of the flushing. This can usually be avoided by taking an aspirin or ibuprofen about 20 minutes before taking X12. (Aspirin works by blocking the prostaglandin pathway.) As far as the pain in the stomach, personally, I find that the only way to avoid it is to have some food in my stomach, and like mentioned before, lots of water.

#27 - AJM - 06/04/2008 - 16:12

I have been using X12 for about 3 months now. it does cause the following in the first stages: strong stomach pains, Frequent bowel movemnets, and tons and tons of engery. I am not hungry when i take it in the morning until around lunch time. I still am not that hungry so i eat smaller portions and feel more energized during the day. am focused and have lost around 10 pounds with exercise. X12 is great if used properly.

#28 - x 12 user - 06/11/2008 - 11:29

horrible

i just took it today to see how bad the pain is. its horrible. dont take it

#29 - x 12 - 06/25/2008 - 10:55

X-12 & Stomach Pains

Wow, I am glad I read these reviews to find that I am not alone! I purchased X-12 (buy one get one free) from GNC last week. I have taken it for five days now, and I do experience the severe stomach cramps, but they last less than ten minutes. I take them with 16 oz water, but not with food. I don't like to eat right before I work out. I did lose 2 lbs in the five days I have been taking it, but I have also been working out harder. Not sure if I should continue the X-12 at this point or not...

#30 - JSM - 06/25/2008 - 16:44

Stomach cramps really bad

Ive been taking X12 for 2 days now and it gave me two things energy and a stomach cramp that is unbearable.I dont recommend this product.I thought i was going to the hospital to the cramps.I will return the bottle to GNC.....ill make sure ill read reviews first before buying weight loss supplement.

#31 - Seattle man - 06/27/2008 - 18:05

I have been taking X12 for the past week and a half. I have never experienced the stomach cramps. I usually take the pill around 7pm and then work out from 8-9. Maybe I don't experience them because I have a full days meals in my stomach. I always feel energized and can work out longer with this pill. I like the pill because I usually don't feel like working out at the end of a long day, but 30 minutes after I take it, I actually want to burn off the energy I gain. I'm not sure how much weight I have lost so far, but my clothes definitely feel loser.

#32 - Philly girl - 07/09/2008 - 17:52

HORRIBLE

horrible, horrible stomach pains. im currently feeling the pains of this pill. im honestly scared. don't take this product.

#33 - Dayna - 07/17/2008 - 00:10


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