Mission accomplished! Introducing new Xenadrine-EFX, the next generation in advanced thermogenic technology.

This amazing, patent-pending formula produces an entirely new level of effectiveness never before seen in the diet supplement industry. In fact, it is the first product ever to be powered by an ultra-potent blend of natural, clinically proven metabolic compounds that work synergistically to produce unprecedented fat-burning results—without containing ephedrine!

New Xenadrine-EFX ultimately provides the most effective approach to losing weight ever developed! That may sound like a bold statement, but remember, this innovative formula was created by the same researchers that brought you the original Xenadrine. And like its predecessor, Xenadrine-EFX is the culmination of years of intense investigation into the sciences of nutrition, thermogenesis and metabolic activation. The end result is a true thermogenic breakthrough that is unequaled in its ability to increase metabolism and promote the fastest possible fat-loss, muscle-sparing results.

In one major university study, the increase in metabolic activity and caloric expenditure produced by Xenadrine-EFX was so extraordinary that even the researchers were shocked. In further case studies, participants lost up to 20 pounds of fat in only 14 days time! These stunning results were up until now, completely unheard of! Scientists believe that Xenadrine-EFX is so much more effective at promoting rapid fat loss because it directly targets a multitude of key metabolic pathways, simultaneously! This is a scientific first!

And on the way, this one-of-a-kind supplement also greatly enhances mental focus and acuity, increases energy, suppresses appetite and provides valuable antioxidant activity, all at the same time.

Diana of Arizona, USA writes:

I have been on Xenadrine EFX for 4 days. I have a lot more energy, feel more mentaly alert wich i really enjoy & my appetite has gone down but if i dont eat healthy then i am hungry at the end of the day. I dont have a scale in my home so I dont know if i have lost any weight. i would like to loose 60 pounds. I sit infront of a computer 40hrs a week. I have started fast past walking 30mins a day. The side effects I believe I have (since I have not felt them before i started to use this) is my body aches, mostly my feet, when I stand up & this morning I gently knocked my bed frame with my leg & it hurt like i had a bruse but I dont, but the aches all go away after I had been up & about. My personality has also changed just a little I am a patient easy going person & every once in a while something will happen like the door not closing properly & it rubs me the wrong way I have a small outburst of rudness toward that item. I will continue to use xenadrine efx until the bottle is gone & if I like what has happened I will purchase more.

Brian of Pennsylvania, USA writes:

This is the first time I have tried a weight loss supplement and so far I love it. I am guy, 5'11", 205lbs. I work out 4 times a week and eat a pretty sensible diet. I have "plateaud" with my diet.exercise program and have given this a try. It has increased my energy tremendously and my workouts have never been better. I am not overweight by any means. However, my biggest problem has been getting enough energy to do my workouts because I am dieting. All I want to do is retain/sculpt the muscle and loose the fat. I have seen a definitiw advantage with this product. I don't believe you can just take this product and expect to be fit/thin. You must combine it with a sensible diet and exercise. I have had some minor side effects wuch as light headaches, but they are going away. I am only taking 2 pills a day, one in the morning and one at lunch.

Kristin of New York, USA writes:

I'm on day 2 of Xenadrine EFX and have had no overwhelming reactions to it. I am not jittery but that is probably because I am used to drinking coffee throughout the day. I have noticed that I am a little more alert than usual. I am using the pills as a boost to my workout routine and am not looking to lose a massive amount of weight. Even though I am slightly under 150lbs, I have been taking 4 pills per day which has not posed any problem for me. I noticed on day 1 that after taking 2 pills in the morning I was starving by the afternoon but that might've been because I only ate a bowl of cereal. I was also a bit nauseous but after eating a few crackers I was ok. I'll continue with this product provided that I don't suffer any severe side effects in the coming weeks. However, it does cause me to urinate quite frequently throughout the day but I'm willing to put up with that!

Jenny of Oregon, USA writes:

I am a 5'5" 132 pound female with the goal of losing 10 more pounds of body fat. Have lost 40 so far. I have been taking xenadrine efx for 3 weeks. Began 1st week with half dose. So far I have gained 4 pounds. First week I had to urinate very frequently and had higher energy. Both have tapered off. I feel bloated. My appetite for food is increased but I do not eat large amounts of food because I can't! I get full very quick with small amounts of food and I eat more frequent small meals. I am excercising more now than I was before and lifting weights 4 times per week with cardio about 4 times also. I am hoping weight gain may be related to muscle gain or water retention. I am going to finish bottle and if I don't feel smaller I will not continue with xenadrine. BTW, last year I lost 20 pounds with a competitor's ephedra based product. I have not gained any of that weight back. I will consider trying the "H" product with ephedra again. I will update later.

Cheryl of New Jersey, USA writes:

I am by far not someone who is taking Xenadrine to lose weight -- just wanted something to kick up my work out a little more and increase my metabolism. So I only take 1 pill daily before a work-out session. Now I get the most out of my workouts, I love the gym. I'm not sure if it's because of the Xenadrine, but I've gained about 3-4 pounds of muscle (probably because of all the weight training). The first week I started taking Xenadrine, however, I noticed that after my workout I felt somewhat nauseous. Once I tried taking 2 pills before a workout, and for the rest of the day I felt nauseous and was deathly pale. Now I am around week 4, and I still take only 1 pill a day, and the nauseous effects have vanished. Working out has never been so pleasurable.

Elisa of Kentucky, USA writes:

I started using Xenadrine EFX on January 1st, 2003. So I've been on it for 1 month and 1 week. First of all, it really boosted my energy. I walk 2-5 miles 5 or 6 times a week. I've also been weight training and doing Pilates. (which is also really great). At first, I only lost a couple pounds in 2 weeks, and I started to get discouraged. And then, within the next two weeks... i lost 7 lbs. In the last week... i have lost another 5 lbs. 2.5 inches in my belly and 1 inch in both my arms and 2 inches in my chest. I'M SOOO EXCITED! Hmm... side effects... occasionally, I get a couple of heart flutters. Nothing that alarms me much. A definite energy boost. My blood pressure has been a bit higher. I have had an incredible mood boost. I have been suffering from anxiety and depression, but in the last month or so I have seen an big difference. My appetite has been slightly suppressed. All in all, i think cytodyne did a good job. I have alot more weight to lose. (about 50 lbs) I'll try to post again in a few months.

Jill of Texas, USA writes:

I am a mother of three young children, the youngest is 1. I've had a hard time this past year getting motivated to lose the excess weight after having the baby & find the time with my hectic schedule to work in an excercise routine again. I started taking Xenadrine EFX five days ago and have a terric results already, with no side effects. I've found that in just the few days that I've been using this product, my energy during the day is great for helping me keep up with my kiddos, but isn't over the top. I was surprised that I've been sleeping a lot better that past few nights as well. I haven't gotten on a scale yet, but have definitely noticed that several pants and shirts are already much looser. As others have mentioned & fitness reviews have stated, everyone is unique and this product isn't for everybody, but it has done great things for me in only five days - absolutely love it.

Heather of Ontario, Canada writes:

OK. I just started this product a few days ago. Im confused, am I supposed to take the pills THEN work out right after I've taken the pills? Because this morning I took the pills then waited 30 mins or so (had more morning tea) before i went to work out. I actually feel more tired than I did before I started taking these pills. I feel like crawling into bed to take a nap than working out. I feel absolutely no energy boost, nor do I feel a suppressed appetite. I was told I might have a high tolerance to caffeine so I upped my dose from 2 pills a day to 4.

Drew of California, USA writes:

This is my 4th day on Xenadrine EFX. So far it seems to be working. My appetite has noticeably decreased and I have experienced a significant gain in energy while exercising. I went running with a friend last night who previously had outrun me on every occasion and I ran so fast that he had to pull up 3/4 of the way through our run to rest. I am 5'8" and weigh 190 pounds and I'm hoping to get down to around 165 pounds, which I weighed about a year ago. Unfortunately, I have had the jitters and awoke last night with a dull pain that was shooting down the left side of my upper torso. If this continues I will discontinue usage.

Linda of Oklahoma, USA writes:

I have used this product. I lost 4 lbs the first week, however it did give me the jitters. Still, I would recommend it if you want to lose weight.

Heather of Indiana, USA writes:

I'm a 23yr old female hoping to lose 35lbs, I'm on day 2 of EFX and already have a decreased appetite, but do have the jitters....however I'm not used to caffine at all so I imagine I will build a tolerance to this....I noticed that a lot of people say it makes them hungry....I think it's a similar side effect to hunger, my stomach also feels kind of funny like when you are really hungry...however I am eating 3 low calorie meals a day and know that I am in fact not hungry..so I can deal with this. Will update more when I have progressed some.

Wendy of Kentucky, USA writes:

5'4 200 lb. female. This is my first day on EFX. I'm so excited. I have felt good all day no jitters, I think my mood is better too. I will post again later.

Amy of Massachusetts, USA writes:

This is my second day on EFX. Over the last year or so I lost 50lbs and I have hit a wall pretty much. I am looking for something to boost my metabolism and help to reach my goal weight. I have started just taking 1 pill 2x a day. No major side effects, except my heart rate has increased while working out and my appetite has increased, even though it is supposed to supress your appetite. No jitters or anything unlike my friend who is on Hydroxycut and is having all sorts of side effects. In two days I have lost 2lbs, so we'll see if it continues.

Jessie of California, USA writes:

First day of taking Xenadrine EFX, didn't really feel any discomfort. But, I went running and I feel great. I could actually feel the endless amount of energy generated by my muscles. And guess what, before my legs gave up, my mouth actually was freezing because the wind was blowing and it was cold, I'll carry on for the next few weeks and hopefully I'll lose the weights I have always wanted to lose. I think I made the right choice this time. Great work Cytodyne!

Bernadette of Pennsylvania, USA writes:

I bought this product wanting to lose about 10 pounds of fat. I wanted to get cut. Instead of losing fat, I gained 8 POUNDS in 10 days of taking Xenadrine EFX. And it's not muscle that I packed on either. Now I have almost 20 pounds to lose thanks to this product. And apparently I'm not the first.

Tara of California, USA writes:

I took xenadrine efx for a few weeks. I didn't notice a lot of weight loss, but I did lose inches!! I can wear a medium top now. Before I was a large. My legs are a bit thinner too. Also, for some reason, the little bit of cellulite I had on the back of my legs towards the top is gone?? weird.. I didn't really excercise I just tried to eat healthy. Which was easy because it is a great appetite suppressant! I took a month off and I am going back on, this time I'm going to exercise and see what happens. I want to lose 10-15 pounds so I can get into a size 8 or 9. I'll let you know what happens.

Rachel of Idaho, USA writes:

I also started Xenadrine EFX three days ago. I have felt pretty good overall. Though I can relate to some of the side effects others have mentioned. First of all I have to go to the bathroom several times a day. This isn't a bad thing, just a little annoying at times. Once in a while I feel my heart palpatating, but very briefly, (scary though). Sudden headaches have come up but they don't last long. As for weight loss and energy gain Xenadrine has been successfull. I think I'm going to finish out the bottle and then call it quits. I don't want to use it too long and it will work as a boost in my new dieting. I am 5'7", 210lbs, looking to lose about 60lbs.

Angie of California, USA writes:

This is my 3rd week on Xenadrine EFX and i've lost 5lbs since. Last week I began to feel a slight discomfort like is something was stuck in my chest and i couldn't swallow it, it was a slight feeling which i feel when i take the 2nd dosage at mid-afternoon. I drink plenty of water to make it go down but i still feel it. Overall, I was hoping to lose weight faster but it's only been 5lbs. One of my friends took it for 3 weeks and she lost 20lbs, but not me.

Jaime of Rheinland Pflaz, Germany writes:

Started taking 1 pill for a couple of days, got slightly jittery (then again I don't drink much caffeine so I'm not used to the stimulant), then increased to 2 pills for 2 more days. I have regular heart palpatations that are not harmful, but on the 2/day days, they were more frequent and kept me awake. If you have any history of heart palpatations, I would strongly suggest NOT to take this product without consulting a doctor.

Amber of Florida, USA writes:

hi, started taking xenadrine efx for the first time about 3 months ago. i noticed more energy and lost a few pounds in about a week. then i ran out of it and stopped taking it, and never got around to buying it. well i'm going to the store tomorrow and can't wait to buy it again to lose a few pounds before christmas. this product definatley gives dramatic results quickly.! it's a great product.

Cris of Rhode Island, USA writes:

Have been using it for 3 days and haven't yet checked my weight, however I am experiencing a few side effects that no one else has mentioned. Such as: Increased urination (up to once an hour), severe thirst, and slight nervousness. At this point, I'll stick with it for a few more days to see what happens. Since I weigh less than 150 lbs, I've started with 2 capsules per day, if I decide to stick with it, I may continue with this dosage for longer than just one week.

Bridgette of Illinois, USA writes:

I started to use this product 3 days ago. Since I'm under 150 pounds, I used 1/2 of what is recommended, 2 pills a day. The first day..i was full of energy but I was had the shakes. The 2nd day, I still had tons of energy but I had an bad headache. The 3rd day, my headache was soooo bad that I couldn't get out of bed. I couldn't sleep but couldn't get out of bed. Today, is the 4th daybut i didn't take the pills today, and my headache is still there..just not bad. I usually get headache here and there but I think that Xenadrine EFX made it more intense. I'm returning it to GNC tomorrow ;)

Heather of Iowa, USA writes:

I just started using Xenadrine EFX. I weigh under 150 lb. but started with 2 pills twice a day. I would recommend starting out with only 1 pill twice a day because I have had some negative effects. I have had no appetite at all and have also felt jittery and a little nauseated.

Mike of London, United Kingdom writes:

Just wanted to say that I really rate this product. I started using xenadrine efx 3 days ago and it has reduced my appetite dramatically, it has also given me a minor mood 'boost' as well. I am only taking one tablet per day to test it out and so far I have lost about 3lbs. No side effects either, I was skeptical at first but I have to say this is an excellent product.

Jasmine of Texas, USA writes:

Bill of Florida, USA writes:

I've tried all the thermogens and metabolizers over the past three years when my fitness efforts got serious. Then, in recent months, came all the ephedra scares and horror stories. Well, after cycling on and off all the thermogens for three years, I finally started on Xenadrine EFX. What a disappointment. No power boost. A very insignificant increase in heart rate on the cardio machines. It is almost completely ineffective for me. Not even a good placebo because heart monitors at the gym don't lie. I've gained 20+ pounds in the two months I've been on this. Oh well. Back to the ephedras. (Hydroxcut, Ripped Fuel) Maybe some danger, but not nearly as dangerous as the growing obesity that Xenadrine EFX has allowed.

Lisa of Sydney, Austrailia writes:

I have just started on the Xenadrine today, I am only on the 2 caps a day program as am under 150 pounds. So far, have experienced little effect, definitely don't have the shakes and have more energy however, I am starving and just ate one hour and a half ago. Drinking lots of water too but still hungry. ahhhh!

Dezyra of Florida, USA writes:

I currently starting using Xenadrine EFX, and I can swear that in two days I have lost a pound. And plus the way my stomach has decreased in general. I'm using this for an after pregnancy thing.. I am 5'2'' and weighed 131 and now 129. So insofar so good.

Young of New Jersey, USA writes:

Profile: 5'9" 145lbs. Male Body type: Compact muscle, high metabolism. Usage duration: Over 4 months (2 pill in the morning, 1 in the afternoon) Workout: 5 days cardio, 4 days weights (15+ hrs/week) Side-effect: none; unlike hydroxycut which made me shake, and Pinnacle MascuLean which gave me occasional acne on my face. Positives: Boost of energy for my workout during the first 2 weeks of use, after that can't notice anything much. Negative: It's suppose reduce my appetite but it seems like it increase my appetite and I'm now gaining weight from eating too much. I plan to keep using for another several months.

Rachael of Texas, USA writes:

I've been taking Xenadrine EFX for a week now, and have dropped about 8 lbs. I'm impressed with the results. I haven't noticed any energy boosts, but I don't get tired when exercising like I used to. Although, I do have the urge to snack more often. Either way, I am enjoying the results, and hope to drop a few more pounds, and will post an update later.

Lou of United Kingdom, Bermuda writes:

I have been using this for just over 2 weeks and have not noticed any weight loss at all so far. I am only wanting to lose about 10 pounds (that I've put on in the last year or so. I have not noticed any side effects either which is good. I'd be interested to know how other people who are not needing to lose much weight are getting on with this supplement. I have heard that it is only really people that have a lot of weight to lose that see the benefits. I currently weigh 116lb and am 5 foot tall. (I used to be 140 so am keen not to go back to that!)

Brian of Massachusetts, USA writes:

I have been taking Xenadrine EFX now for several months, and while I have not seen dramatic results like the ones in the pictures, I have been able to stay slim while eating less than perfectly and it gives me a great uplifting feeling and plenty of energy. I think the 4 pill dose is overkill and without steady cardio it will still only have a nominal effect. Blows away Hydroxycut though as those gave me the shakes, bad.

Jenny of Illinois, USA writes:

I have been using Xenadrine EFX for 3 days now, and so far, I love it! It greatly reduces appetite and food cravings. After only one day of taking it, my stomach was noticeably more flat. It also gives me a lot of energy in the morning ( great for classes at school ). This is my first time taking dietary supplements, and I'm impressed. I will write an update soon on how my weight loss is coming along. The only side effect I've experienced are mild stomach cramps... a small price to pay for the positive effects of EFX.

Tom of Ohio, USA writes:

After three weeks---Use has been somewhat sporadic. A two-pill dose twice a day is definitely overkill for my size and weight (5'10", 170 lbs.), resulting in a racing heartbeat along with the energy boost. Although I'm far from a medical professional, my degree in biology definitely leads me to believe that the bulk of the effect felt by these pills comes from the caffeine. Again, that's just an opinion. As far as my experiment with supplements, it's over. I am discontinuing use. Thankfully, wedding planning is going along extremely well, allowing me the time to get back to the gym more steadily. My advice--put in the sweat etiquette. You'll get better, longer lasting results. Best of luck to you!

Cynthia of Oregon, USA writes:

On day 2 of this supplement. I previously used Hydroxycut without a lot of results, but with a lot of jitters. This has given me absolutely no jitters at all, but it still has totally bottomed out my appetite! So far, I am very impressed! I am looking forward to seeing how it has done for me in terms of weight loss in a few weeks, combined, of course, with exercise and diet.

Karla of Texas, USA writes:

Let me just say that it is difficult to find something that can compete with ephedra-based fat burners, but this is a great alternative. Not only does it give me plenty of energy, it also seems to put me in a great mood. When I got on the scale a few days later I was pleasantly surprised. I use it for maintenance, and I'm sure it's also great for people that are getting started or on their way to reaching their weight loss goals.

Tom of Ohio, USA writes:

Day 1 of taking Xenadrine EFX. I definitely noticed an increase in energy today, but cannot say for certain if that's just an artifact of the caffeine in the pill or the result of getting more sleep lately. This is the first time I've ever used any supplements. I'm three and a half months out from my wedding and hoping to drop 10-15 pounds by the big day. Updates will continue and here' to hoping it works.

Stephen of Arkansas, USA writes:

The first day I took EFX was an awakening. EFX gives you so much more energy than a cup of coffee. However, EFX does not give you a "jittery" effect. I strongly suggest drinking nothing but water with EFX because anymore intake of caffeine will definitely be too much. EFX also seems to keep me going all day long even hours I have taken the daily dosage.

Hector of Texas, USA writes:

Have just started the supplement, so this will be a "journey" journal. Will continue to follow up. EFX made me hungrier, but also gave me more energy. It makes me feel more awake than taking a cup of coffee, which is what they compared the stimulant action to. The stuff isn't bad at this point, but if you are a person that has a problem with horse pills, think about this one! I was at 215, (I am a 5'7" male), and in the three days went to 213. Other than the hungries, it's prestty good for giving you the energy boost. That is where a diet and excercise program needs to start, the boost off the couch or chair. This does it. Please, PLEASE!! If you have risk factors, check with the doc. I am low risk, though I have sleep apnea. It's a good supplement, but only you can maximize its effectiveness.