5 Things Dr. Oz Didn’t Mention About Raspberry Ketones

dr.-oz-raspberry-ketoneDr. Oz says that raspberry ketone supplements are …”fat burners in a bottle…” but there’s much more to the story. Here, we look at what Dr. Oz didn’t tell you about his latest favorite “miracle” supplement.

“Boost energy and burn fat with the Pure Raspberry Ketone!”

“Number One Miracle in a Bottle!”

“Raspberry Ketone: Fat Burner in a Bottle”

If you watch The Dr. Oz Show, you’ve probably heard about the latest must-have weight loss solution that the show claims is a “Fat Burner in a Bottle.”  In fact, since Dr. Oz recently aired his segment promoting it’s fat-flushing benefits, sales of the supplements are soaring.  Now, Oprah Winfrey, Kim Kardashian and other celebs are reportedly pimping raspberry ketones too.

But before you jump onto Dr. Oz’s latest overly hyped and highly sensationalized “miracle,” there are five things you probably don’t know about raspberry ketones and their purported ability to help you lose weight.

1. No human studies show that raspberry ketones aid in weight loss or fat burning

Raspberry ketones are natural phenolic compounds in red raspberries that create the aroma of the berries. The only published scientific health research (there have been three studies to date) on raspberry ketones are considered preliminary because they are either animal model or laboratory studies. No studies have  have been conduced with humans. Not one.

All three studies were conducted in Asia and published in small experimental publications rather than major medical journals. There was no disclosure by the researchers whether or not the supplement industry funded their studies, but one would expect that they were probably funded by the industry.

One study reported that feeding raspberry ketones to rodents resulted in increased secretion of adiponectin, a hormone secreted by fat cells that helps the body break down fat and plays a role in obesity and insulin resistance. In the other study, mice were fed a high-fat diet with varying amounts of raspberry ketones.  The results showed that those with higher amounts of raspberry ketones were protected against fat gains and increased fat oxidation (burning). The third study exposed fat cells to raspberry ketones and found that the ketones were able to stimulate lipid metabolism by stimulating lipolysis, and the secretion of adiponectin in specific types of fat cells.

There’s a big difference between mice and humans and while the preliminary research is of interest, many more studies (including human studies) are necessary to make any type of claim that the products will help a human lose weight or increase fat burning.

2. Dr. Oz’s raspberry ketone expert, Lisa Lynn, is Not a weight loss expert

The other suspect part of the Dr. Oz segment about raspberry ketones is the so-called “expert,” who promoted the supplements. The segment features Lisa Lynn, who Dr. Oz referred to as a weight loss expert. However, Lisa Lynn has is not a dietitian, has no nutrition degree, is not a nurse or medical doctor. She does have certificates for exercise training from the International Sports Sciences Association and she sells raspberry ketone supplements on her website in the LynFit Accelorator product, which you can buy for $33.00 on her website. That doesn’t make her a “weight loss expert,” and certainly doesn’t qualify her to speak about the nutritional biochemistry of ketones and fat metabolism.

After hearing what she said on-air about the supplement, I knew immediately that she has no biochemistry or nutrition background:

Dr Oz: How did you find this? lynfit-raspberry-ketones

Lisa Lynn: Research, research, and research.

Lisa, where is the research.  There are two published mice studies in the worldwide medical literature database.  Where are you getting your “research?”

Lisa Lynn: They[raspberry ketones] help your body burn fat. They slice it [fat] up in the cells so it burns fat easier….”

From nutritional biochemistry, there is absolutely nothing that “chops up,” or “flushes” fat from the body.  it’s just simplistic ludicrous statements mean to get people to buy into the promises of the product.

3. Raspberry ketone supplements provide more than raspberry ketones

The other problem with assuming that Raspberry Ketone supplements aid in weight loss is the fact that most of the products contain much more than raspberry ketones. They often contain green tea, hoodia (a known appetite suppressant), caffeine or capsaicin (compound that makes peppers hot.) All of these ingredients have more evidence to providing a weight loss benefit than raspberry ketones. I believe the supplement manufacturers do this intentionally so that they can hedge their bets with product that have every possible item to aid in weight loss in one supplement.

However, the impact of all these items together would result in small impacts on our body weight. WE can do much more to lose weight by eating raspberries and other healthy foods than by spending upwards of $25.00 per bottle of raspberry ketone supplements.

4. Manufacturers don’t back up their product claims

After I watched the Dr. Oz raspberry ketone segment, I emailed and called several companies that manufacture and sell raspberry ketones nationally. I asked them all for any evidence to support their claims.  Not one company returned my calls or emails and none provided any scientific evidence to support their claims. What’ more, with no efficacy studies, manufacturers have no basis for which to base any dosage amounts of raspberry ketone.  That is why every supplement has different amounts of raspberry ketone as a suggested daily dosage.  That’s another red flag that these supplements are more hype than help.

This is why if you look at the small print on the bottles of the supplements, you will see an astericks by the fat-burning, metabolism-boosting claim. If you go to the astericks, it reads:

This information has not been evaluated by the US Food and Drug Administration, nor has it gone through the rigorous double-blind studies required before a particular product can be deemed truly beneficial or potentially dangerous and prescribed in the treatment of any condition or disease.


5. Supplements rarely measure up to all the hyperaspberry-ketone-pills

This may be hard for many people to swallow, but the overwhelming scientific evidence shows that there is no short cut to being fit, healthy or lean. Because the vitamin and supplement industry is not regulated by the US Food and Drug Administration (FDA), few consumers are aware that many supplements have not delivered on their claims. In 2010, the vitamin and supplement industry grossed $28 billion.

Bottom line: To burn fat, focus on eating fewer calories than you do normally and getting more exercise. Eat primarily natural, wholesome foods like fruits and veggies, whole grains, lean protein and healthy fats.  If you want to try a supplement for added health benefits, do your homework and don’t just jump onto the latest fad Dr. Oz or anyone else is touting

–Julie Upton, MS, RD, CSSD


  1. says

    Thank you, thank you, thank you! If Dr Oz would stop promoting hope in a bottle and use his ability to reach millions of people by getting out proper information he might actually be helpful! Thank YOU for giving credible nutrition information!

  2. Laura Stepp says

    AMEN! Go Julie! Thank you so much for doing this research and writing about this. I, too, have had questions re: this product as well as a few other things Dr. Oz talks about on his show. Dr. Oz is doing one thing right – keeping us in business so we can talk about the real truth and the real evidence behind getting healthy and staying healthy. Thank you again, keep up the great work.

  3. Laura Jacoby says

    I always have to watch Dr. OZ with a grain of salt. He never gives all the information, just info that will sell products and raise his viewing audience. I am tired of watching his show…Just this week he had on a diet specialist that talked about the farmer/hunter diet types. The women they focused on the show looked like they did not exercise and want a quick way to lose weight. Weight doesn’t come from taking a pill, it doesn’t come from eating healthy alone. It comes from pushing ourselves away from the table and getting up off the couch. Weight loss is a lifestyle change, from sedentary to active, while eating less calories. Dr. OZ makes women think there is hope for them because they can take a simple pill that will take the place of exercise. But Montel said it right on yesterday’s show. “Montel has the body he has by working at it everyday.” A fit body does not just happen, by taking a pill and eating a bag of Doritos.

  4. Mike Sandoz says

    Nice write up. More people need to read this. When it comes to wonder weight loss solutions, it is simple. “Don’t believe the hype!”

  5. says

    Thank you! I often question Dr. Oz’s nutrition information. Too bad he doesn’t look at the evidence before he gives out misleading nutrition information. Great article!

  6. says

    Thank you for sharing this information – I really wish that “expert” was a legally protected credential. And I would love to see live commentary from you scrolling across the screen during the Dr. Oz show.

  7. Courtney McNamara, MS, RD, CDE says

    Great write up, very prompt. I haven’t watched Dr. Oz in a while until last week when the entire segment was on “nutrition” magic bullets to burn fat from various areas of the body. When he first started the show, he had great, realistic advice. Now he just seems like a sell-out and is doing the public who views his show a huge disservice. Good job!

  8. says

    Thank you for writing this informative article. Much appreciated as a fellow registered dietitian whose goal is to promote nutrient-rich whole foods and physical activity for optimal health and a healthy weight. Great job!

  9. Siri Zimmerman, MS, RD, LD, CDE says

    Im so happy you did this. A frustration of mine is “well Doctor Oz said…” People have a tough time finding good information so they’ll take anything available. Truth is, Doctor Oz is running out of ideas and in the meantime, running out of credibility with these spoof shows about raspberry ketones and whatever else. Have we not learned that exercise is the best medication ever for almost all major issues. Jump on that Dr. Oz!!

  10. Alesia says

    Thanks for this. I’m glad you’re calling him out on this. He’s always seemed more interested in getting higher ratings and boosting his profile than distributing useful and accurate health information.

  11. says

    I have enjoyed reading all these.. I used to watch dr oz, but I stopped. I am 56 going though menopause. I have gained alot of weight. I work a man job I do alot of lifting 50 pounds or more.. I,m trying to stay in shape. I’ve been trying alot things that dr oz has said, I don’t know what I can mix.. I just stopped watching. There’s just to many.. I’m going though menopause naturally..

  12. says


    Thanks for sharing. Keep reading our site as we always write about the “real” ways to find a healthy weight and taking approaches that work and last a lifetime. For the most part, those are things that don’t involve any supplements, but are more what mom told us…eat more fruits and veggies, eat less sugar, saturated fat and animal-based products…move (which your job seems to cover), limit alcohol (or skip it altogether if you really want to get rid of those empty calories), limit packaged processed foods and keep it simple.

    Of course, eating healthy is not always the easiest, least inexpensive or most convenient way to eat, but boy, the end result is really worth it.


  13. Russell says

    Julie, I noticed that you quickly deleted my comment stating my research regarding Lisa Lynn’s certifications. Would you please explain why? Kindly,


  14. says


    I didn’t mean to delete it, I just had to do the research and to my dismay, I see that Lisa Lynn actually sells Raspberry Ketone supplements. I would think that this should have been mentioned on the show.. A bit of a conflict of interest, no?

  15. Ashley says

    Hi there, since I saw the show I’ve actually been doing a lot of reading on raspberry ketone and how it actually works and what I’ve found is that while it does work, the way it was described on the Dr. Oz show was kind of dumbed down and left out some very big points. Raspberry ketones do raise adiponectin levels, that is true however adiponectin is most commonly found is people who are on low carbohydrate diets. Adiponectin is a formed in the breakdown of adipose tissue, (fatty tissue also known as our “love handles”, “the few extra pounds” and whatever else we like to call it.) Adiponectin has been found to be the primary function of ketosis. The original study with the mice showed that when the mice were fed a high fat diet, the raspberry ketone raised levels of adiponectin which means that in other words it pushed the mouse’s system into ketosis which allowed the mouse’s body to switch over to burning fat as fuel rather than burning carbohydrates, (otherwise known as glycolysis). I read this and decided to try it on myself. I used a raspberry ketone supplement I got off amazon called raspberry ketone burn but I’m sure the brand isn’t important. Following a low carb diet (I used a cyclical ketogenic diet for this but I’m sure atkins or south beach might work), the main thing was that I only took in about 30 grams of carbs in the form of vegetables and salad greens. I ate moderate protein and the for the rest of my calories I used olive oil, a healthy fat. Now normally when I do a cyclical ketongenic diet it takes me about 3 days to register ketosis on the ketostix however I noticed that when I started taking raspberry ketone I got into ketosis in about 1 day and while in ketosis, registered deeper levels than I normally got without the raspberry ketone. Needless to say, I found that I was able to lose more fat while on raspberry ketone than I did without it so I’m convinced that it does work but I do wish that Dr. Oz had explained this rather than glossing over it for the masses leaving many women thinking they could just keep eating the way they had been and still lose weight.

  16. Carol M. says

    I found your site after Googling “Dr. Oz promoting raspberry keytones for weight loss”. I did watch the show when this “weight loss miracle supplement” was featured and I admit I immediately went to iherb.com and purchased 3 bottles of it, I think I paid something like $8 per bottle, nowhere near the $33 mentioned above. Last year I lost 24 lbs in 3-4 months by cutting out sugar & starch plus limiting my alcohol. Prior to that I had gained the same 24 lbs by drinking wine every night while sitting on the computer for hours on end. Duh, the wine was turning to sugar and then I was going to bed! Once I was sick of being chubby it seemed fairly easy to lose it once I knew what to cut out, I thumbed thru the South Beach Diet book and made a list of things to avoid. My dietary deletions eliminated the fat right where I wanted, from below my breasts to the top of my pelvis, i.e. the “belly”. However, now I’m going on 54 yrs old and am perimenopausal so I’m having issues with belly bloat among other things. I’m getting frustrated that I’m not getting the same results as I did on last years low carb session, thus my purchase of the raspberry keytones.
    Funny thing is, when I went to iherb.com to place my order they had several t.v. “doctors and specialists” photos on their home page where you could click on their photo to see what they promoted. I didn’t bother but recently I went back on to order some of my other supplements and the celebrity photos were gone! And that was about the same time Dr. Oz said on air that he wanted a correction regarding the raspberry keytones because some websites & companies were using his name, claiming that he promotes these keytones for weight loss and he never said that! Interesting timing of those events, but here is why I was doing further online research today>>>
    I’ve taken them a couple times and it seems that I get a flu like feeling during the day that lasts into the night and then I wake up with a bad headache. I heard somewhere that they are actually a type of hormone? Could this be what is causing my issues? Are you aware of other supplements that might not mix well with them? I had also started taking plant sterols since my dietary changes have not lowered my cholesterol to my doctors standards so I wonder if the two don’t mix? I guess at least for now my newly found keytones will just sit in my cabinet and I’ll have to throw some exercise into my weight loss program (Ugh, it kills my arthritis damaged joints).
    Glad I stumbled onto your site today, I’m going to sign up for new comments and bookmark your site, great info, thanks!

  17. says


    Thanks for writing in to us. I would throw out the ketones and probably see a local dietitian who can consult with you regarding what you are taking and what may be interacting with other medications/herbal remedies.

    Generally, we tell people to go off all supplements to see if their issues resolve, then add back one item at a time every 5 days or so to see if the symptoms are associated with one particular item/food/supplement.

    Keep following our site as we’re going to have more and more weight loss articles and research because we’re writing a weight loss book and we are covering the issue you mention above.



  18. Carol M. says

    Thanks a bunch Julie, I’m going to toss the Keytones. My primary doc requires that I see him every 3 months for blood workup and follow up consult. At the follow up I always bring a typed list of all supplements I am on at the time and he reviews it, asking my reason for taking each one and tells me what to delete or keep. He knows I’m for avoiding RX remedies whenever possible + am always researching natural remedies so he’s good about it, plus he has studied for many years about the holistic/natural/prevention approach so I guess I got lucky when I found him.

    I did what you mentioned plus went 9 days with no alcohol. Funny thing is now I think I’m Lactose intolerant! Didn’t realize all those Protein Powders I was using in my smoothies had milk products/whey that seemed to be a culprit in bloating, plus on top of that I was adding yogurt & eating protein bars in between! Cut it all out a few days ago and will continue to test other foods and supplements in longer intervals as you suggested.

    I’ll keep an eye on your site for more valuable info, thanks again!

  19. Crazy With Spam says

    The only reason I found this page is that I have been getting a bunch of “Raspberry Ketone” spam emails and wanted to know who woke up and made raspberries king. Now I know. Thanks, Dr. full of Oz, for feeding the ridiculous appetite in this country for quick fixes to obesity. But, more importantly, thank you SINCERELY, Julie Upton, for setting the record straight. Fewer calories and more exercise … good sound advice .. and everything in moderation!

  20. Jim says

    I am saddened to read this page. My brother sent the link to me. I appreciate the information about the raspberry keytones and giving another viewpoint. I have not been big on watching Dr.OZ, but he seems so sincere and in the shows I’ve watched, it seems his opinion has been helpful to many on various topics. I hate the idea that he may be into promoting supplements or foods for commercial purposes. I guess it bothers me that there seems to be a lot of Dr OZ bashing with little good things said about him. I signed up for your news letter and hope I don’t see much more of it. He may have have failed to research the raspberry keytone facts and brought on a so called expert that has a monetary interest in selling supplements, but can all his shows be less then truthful?
    I’m 63, out of work and dealing with pain in my left foot, right knee and numbness in my right hand, especially the pinky, can’t feel anything at all. So About 2-3 weeks ago I committed myself to eating healthier and cutting out my usual fried chicken and various rice dishes. I’m now eating more vegetables, fruit and staying away from ice cream and anything loaded with sugars, fats and carbs. I’m learning. Now I bought a bike and plan to get much needed exercise riding daily.

  21. says


    Thanks for your comments. I hope we can provide you information that you can put into practice into your life to live well!


  22. Marcy Anders LPN says

    Never judge a book by it’s cover. Be smarter than the pusher of the product. It’s good to do your home work!

  23. theresa says

    I don’t need studies to convince me that raspberry keytones is successful. My uncle and sister are on it and have lost over 20 lbs during the last 2 months. After hearing this, I started taking it and have lost 4 lbs in 2 weeks. My waist feels a little slimmer. I believe that is where I lost the 4 lbs. My motto is, don’t knock it until you give it a try (a reasonable amount of time}

  24. Wendy says

    If you have candida diabetes or cancer DO NOT TAKE!!! I have candida and these pills have a made me sick. Ketones are an excellent food source for candida and fungal cell walls. I took one pill. It gave me stomach pains and cramping massive diarrhea and have been throwing up. Do your research before taking these pills I failed to do so and am suffering the consequences now.

  25. says


    Raspberry ketones aren’t recommended by us, so we would never suggest that you should take them if you’re on thyroid medications

  26. Carol M. says


    I posted on this site a few months ago about Raspberry Keytones and I’ve since been diagnosed with Hashimoto’s Disease, an auto-immune disorder where the thyroid is actually attacked and killed off. I’ve been on Levothyroxine 75 mg for about 3 months and I wondered the same thing since I had already purchased 3 bottles of Raspberry Keytones from iherb.com JUST prior to my diagnosis. I was so tired and lethargic, plus slowly gaining back weight I had lost the year before that I was trying to find something to speed up my metabolism vs. caffeine, so when I saw Dr. Oz promote the keytones I decided to try it and ordered it right away from iherb. I always look things up on that site vs. buying directly from the promoter of the product because I can read user reviews who have nothing to gain from sale of the product.

    I HAVE taken my Raspberry Keytones sporadically since I’ve been on my thyroid meds and I did not notice any issues of concern. I’m usually prone to blood sugar attacks but didn’t have that issue the 3-4 times I’ve taken them both in the same day. BUT if you asked me the same question I would say not to combine the two since they both supposedly do the same thing. And I will say that I personally am not comfortable with taking the keytones along with my thyroid meds for any length of time.

  27. Esmeralda Velasquez says

    I began using Raspberry Ketone after it was suggested to me (I’ve been struggling with my weight loss lately). Later, it came on the Dr. Oz Show, so I continued to take the product although I saw ZERO results. I stopped after three months because it just began to seem silly spending so much money on a “nutritional” product that didn’t work. Thought it was just me though.. so glad I saw this article!

  28. Guilherme says

    well done, good job. I’m from portugal i enjoy so much read this . once again tanks a lot

  29. Nothappy says

    I wish Dr. Oz would be more responsible in his endorsements, and stop using the term “miracle fat burning” product. This is BS. I’m 33 years old and I have about 8 pounds to lose. Within 2 days of starting the Raspberry Ketone, I started having heart palpitations and severe insomnia (I could actually hear my heart beat very loud… I was shaking and I thought I was going to lose my mind). Stupid me, I continued taking if for a total of 2 weeks, at which time I missed my period. That’s when I decided to stop taking it. This product disrupts your hormones. It is dangerous, and simply not worth it.

  30. says


  31. Nikki says

    I am trying this product now. I will be one of the unofficial human study participants. Others are online too, taking this product, and there are raving reviews about it, depending on what brand they use. And to anyone having stomach cramps, it is due to lighter stools because of the fat burning (hence the diarrhea as well). And there is a short-cut to burning fat… has anyone tried Atkins? I have, and it WORKS! And it’s faster than the ketones. I am trying the ketones because I have reached the dreaded plateau of weightloss after losing 15 lbs. on it. I’m impatient. :) And Lisa Lynn is talking about lipolysis when she talks about “chopping up fat.” She could’ve worded it better, but why get all scientific and wordy and confuse the audience with jargon?

  32. Christy says

    I just started taking Alli, a diet pill approved by the FDA, and I was wondering if it is okay to take Alli and the Raspberry keytone together at the same time?

  33. Chloe says

    Nothappy how long after you stopped taking it did your periods return? And are they back to normal now? I have been taking it for about a month and my period is 7 days late and nothing yet.

  34. Sonny_Bee says

    I do not watch Dr. Oz’s show, but saw the clip on the internet. After seeing it and buying what he and the “expert” were reporting, I decided to try this supplement. After three days, I’ve experienced nothing but slight jitters, stomach cramps, light fogginess, trouble sleeping, and a slight decrease in appetite. I paid $20 for Hi Tech Pharmaceutical’s product from GNC, where I spent a good deal of time with one of their associates about it. After reading more and learning that the Dr. Oz segment was not a reliable resource for information, but only a vehicle to sell pet rocks to desperate hopefuls, like myself. A $20 lesson that I need to just eat right and move my body more. Stay healthy, all! 😉

  35. Kenny says

    Having been a high level athlete for over 20years & vegan, I find the SHORTCUT mentality very sad. The formula to good health has been the same for centuries; lots of fresh fruit & vegetables, whole grains, clean protein, good rest & get off your ass put in some hard work & earn it. THERE IS NO MAGIC PILL !

  36. says

    I took only half of the dose of the Raspberry Ketones and in 5 min felt nauseous, then vomited out in about 15 more minutes. I felt lots of saliva production meanwhile. I have low thyroid function and am on Levotheroxin (75 mcg my dose)/ I insist it is not good for people with thyroid problems and maybe at all now after I googled for all the complaints of other people. DO NOT BUY THIS POISON.


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