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Kimberly Tenner
November 28, 2019

Raspberry Ketone for Weight Loss: Is Dr. Oz Right?

raspberry ketoneEver since Dr. Oz praised raspberry ketone as a “fat-burner in a bottle,” dieticians, fitness experts, and nutritionists can’t stop talking about this unique weight loss ingredient.

“I’m interested because it seems like it might give a bit of a jump start to the challenge of losing weight and it seems to be a condensed version of raspberries, which are good for you in general anyway,” explains one anonymous consultant. [1]

“Anytime there’s anything around weight loss everyone jumps on the bandwagon looking for an easy fix,” explains Sharon Meyer, nutritionist. “Raspberry ketones have their place, but it’s the extraction that I think is complicated.” [2]

But what is Raspberry ketone and how can it help you?

What Is Raspberry Ketone?

Raspberry ketone, or rheosmin, has been used as a flavoring agent since the 1920s due to its aromatic nature.

Despite its name, natural raspberry ketone is not extracted from red raspberries. Although raspberries contain raspberry ketone, their natural content is very low. Consequently, manufacturers utilize peaches, grapes, apples, rhubarb, and even tree bark to create sufficient raspberry ketone concentrates. [3]

Raspberry ketone is structurally similar to synephrine and capsaicin. [4] Synephrine is said to be the weight loss equivalent to ephedrine that interacts with the central nervous system to increase energy levels and promote fat burning. Capsaicin is a chili pepper extract which promotes thermogenesis. [5] You can read more about what raspberry ketone is and how it works by visiting here

Although research is limited, raspberry ketone is said to offer numerous weight loss benefits without negative side effects:

Potential Benefits

• Weight loss
• Increased metabolism
• Strengthened immune system
• Elevated energy levels

How Does It Work?

Experts believe raspberry ketone stimulates the release of norepinephrine, an adrenal hormone which causes fat cells to breakdown into fatty acids. The liver then converts the fatty acids into ketones. Ketones are then used as an alternative energy source.

Is There Clinical Research?

Unfortunately, raspberry ketone studies are limited to two animal studies.

raspberry ketone studyThe first study was conducted in 2005 on mice fed a high-fat diet. Researchers found raspberry ketone prevented the high-fat-diet-induced elevations in weight and fat in the liver. The data suggested raspberry ketone achieved this effect by increasing norepinephrine-induced lipolysis. Experts concluded, “RK prevents and improves obesity and fatty liver.” [6]

The second study was conducted 5 years later and also featured mice on a high-fat diet. Experts found raspberry ketone supplementation increased the expression and secretion of adiponectin, a hormone that regulates glucose while processing fatty acids in the blood stream. “These findings suggest that RK holds great promise as an herbal medicine since its biological activities alter the lipid metabolism.” [7]

While promising, further human trials need to be conducted to validate raspberry ketone’s weight loss potential.

Are There Any Risks or Side Effects to Worry About?

Raspberry ketone’s effects in humans are unknown. It has not been sufficiently studied to determine short or long-term benefits and side effects.

Due to its chemical similarity with synephrine, many express concerns about its potential to increase negative cardiovascular events such as hypertension. Consequently, patients with an increased heart attack risk should avoid raspberry ketone for weight loss.

According to WebMD experts, “there are anecdotal reports of jitteriness, increased blood pressure, and rapid heartbeat among people taking raspberry ketone supplements.”

However, without studies, it is unknown whether these effects are associated with raspberry ketone specifically, or additional ingredients found in raspberry ketone supplements. [8]

Does Dr. Oz Recommend A Specific Raspberry Ketone Supplement?

Although Dr. Oz expressed his amazement with raspberry ketone’s weight loss potential, he has not ever recommended or endorsed a specific raspberry ketone supplement.

“I am not and have never been a paid spokesperson for any particular brand, supplement or product,” writes Dr. Oz. “’I’ve even decided to no longer use brand names on The Doctor Oz Show. My mission for the last three years has always been to better your health and make your busy lives easier. I care about you, value your trust, and want to protect your safety.” [9]

Consequently, dieters should be cautious about buying any raspberry ketone supplements. If advertisements are flashing Dr. Oz’s photo or claiming his endorsement, the manufacturers are lying to you.

Tips to Avoid Raspberry Ketone Scams
When Dr. Oz promoted raspberry ketone as a weight loss ingredient, thousands of dieters flocked to raspberry ketone supplements to slim down.

With so many people demanding raspberry ketone supplements, diet pill manufacturers were quick to carve their piece of the profits.

However, not all manufacturers are trustworthy, and more often than not, raspberry ketone supplements contain fake raspberry ketone or concentrations too small to be effective.

Fortunately, there are a few tips to avoiding diet pill scams:

tips to avoid scams• Choose supplements made in the US or Europe. Products manufactured elsewhere do not follow the same ingredient standards.

• Make sure the supplement does not contain ephedrine.

• Look for product certification.

• Avoid products with over-the-top and dramatic weight loss claims. Raspberry ketone won’t change you overnight.

Should You Try Raspberry Ketone for Weight Loss?

Preliminary evidence is promising, and there are numerous success stories involving raspberry ketones. However, even this potentially powerful ingredient is no magic bullet for weight loss.
Even Dr. Oz recommends raspberry ketones work best “when paired with regular exercise and a well-balanced diet.”

While it may be worth trying, more information is needed to verify raspberry ketone’s effects on human test subjects before dieters should spend a fortune on the latest RK fat burners.


[1] Allen, Jane. “Raspberry Ketones Freny Follows Dr. Oz Show.” ABC News. April 5, 2012. Available from:

[2] Johnson, Carolyn. “Health experts question raspberry ketone diet craze.” ABC Local. Feb. 17, 2013. Available from:

[3] Nicholas, Gayle. “Is Raspberry Ketone Effective for Weight Loss?” Medscape today. Dec 11, 2012. Available from:

[4] Morimoto C, Satoh Y, Hara M, Inoue S, Tsujita T, Okuda H. Anti-obese action of raspberry ketone. Life Sci. 2005;77:194-204. Available from:

[5] Lejeune MP, Kovacs EM, Westerterp-Plantenga MS. “Effect of capsaicin on substrate oxidation and weight maintenance after modest body-weight loss in human subjects.” Br J Nutr. 2003 Sep;90(3):651-59. Available from:

[6] Morimoto C, Satoh Y, Hara M, Inoue S, Tsujita T, Okuda H. “Anti-obese action of raspberry ketone.” Life Sci. 2005 May 27;77(2):194-204. Epub 2005 Feb 25. Available from:

[7] Park KS. “Raspberry ketone increases both lipolysis and fatty acid oxidation in 3T3-L1 adipocytes.” Planta Med. 2010 Oct;76(15):1654-8. doi: 10.1055/s-0030-1249860. Epub 2010 Apr 27. Available from:

[8] “Raspberry Ketones.” WebMD. Available from:

[9] Oz, Mehmet. “My name for Profit? Not Anymore.” The Dr. Oz Show. Available from:

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