Dexyfen Review

Image Sports calls their new weight loss pill Dexyfen a “weight modulating masterpiece.” Although the word choice of “modulating” might not be perfect, it’s clear Dexyfen is supposed to help users reach their weight loss goals.

Like every new weight loss pill, Dexyfen promises to outshine the old competition. So, let’s see if Dexyfen has what it takes.

How Is Dexyfen Supposed to Benefit Users?

Dexyfen is “formulated to help suppress appetite, burn fat, and maximize energy” — the 3 results every dieter wants.

If Dexyfen suppresses appetite, users will be able to cut calories without interference from hunger pangs. Appetite control is also essential for making healthy dietary changes.

If Dexyfen burns fat, users will shed fat and weight faster. Besides enhancing body composition, fat burn improves lipid levels, cardiovascular health, and energy production.

If Dexyfen maximizes energy, it will be easier for users to exercise and stay physically active. Exercise is essential for long-term weight loss, but it also improves health in general.

Do Users Like Dexyfen?

Eighty-one users left feedback for Dexyfen on The average rating was 3.6 out of 5 stars with 70% of users saying they’d recommend Dexyfen to others.

Forty users gave Dexyfen 5 stars. These people didn’t experience any problems or side effects while using Dexyfen. They say it provides all-day energy, curbs cravings, and burns fat fast. Several people said Dexyfen is the best fat burner they’ve tried.

Fourteen users gave Dexyfen 4 stars. Most were thrilled with the results and didn’t report any problems. However, several users complained Dexyfen tasted bad and caused jitters, sweating, and a burning feeling. A few people said Dexyfen didn’t give them all the promised benefits.

Twenty-six users gave Dexyfen 1-3 stars. There were many complaints about Dexyfen’s bad taste and ineffectiveness. Side effects were a big problem, too. In fact, several people experienced these issues:

• Hives
• Skin burning, itching, and redness
• Flushing
• Sweating
• Rapid heartbeat
• Shaking

When side effects are mild, users may continue using an effective weight loss pill anyways. But several users said the side effects were so severe they would never use Dexyfen again — effective or not.

What Ingredients Are in Dexyfen?

Dexyfen contains a few ingredients I’m familiar with. But I was thrown by a few more foreign-sounding substances. It didn’t take me long to realize these are well-known ingredients. However, I have yet to figure out why Dexyfen uses them.

Thiamin (Vitamin B1) – The body needs thiamin to convert carbs into energy. Without thiamin, fatigue, muscle weakness, and pain may occur. Thiamin also breaks down fats and proteins, and maintains digestive tract muscles.

Niacin (Vitamin B3) – Niacin is essential for energy production. In fact, fatigue is one of the first signs of niacin deficiency. Niacin helps cells regenerate and improves calcium absorption, which keeps hair, skin, and nails healthy.

Caffeine – By stimulating thermogenesis, caffeine causes the body to burn calories rather than convert them to fat. It also boosts energy, improves focus, and suppresses NPY. NPY is a stress hormone, which increases appetite.[1] Research shows caffeine boosts thermogenesis by a significant 11%.[2]

Oryza Sativa – It’s just rice extract. There’s no research proving it suppresses hunger, increases metabolism, or boosts energy. Image Sports doesn’t explain why they use this ingredient or the next two.

Mentha Haplocalyx – Also known as mint, mentha haplocalyx was not proven to enhance weight loss.

Zanthoxylum Piperitum – This ingredient is a Japanese pepper. It doesn’t contain capsaicin; a common pepper component that burns fat. And there’s no research proving zanthoxylum piperitum burns fat or lessens cravings.

Pausinystalia Yohimbine – Yohimbe is the active substance. It’s a stimulant, which increases libido, burns fat, and boosts energy production. The research is limited. However, one study showed athletes’ physical performance improved after taking yohimbe.[3]

The Dosages

Each Dexyfen serving is 1 capsule. Image Sports only discloses 3 dosages they use in each serving:

• Thiamin – 120 mg (8000% Daily Value)
• Niacin – 30 mg (150% Daily Value)
• Proprietary Blend – 555 mg

The thiamin toxicity risk is low because the body excretes excess thiamin quickly. So then, why does Dexyfen have so much thiamin? Your body probably won’t use most of it. And too much thiamin causes side effects like those Dexyfen users reported.

Niacin may cause skin flushing and itching. The large dosage in Dexyfen increases this risk.

The proprietary blend contains the remaining 5 ingredients. Since 3 ingredients weren’t tested, there isn’t a recommended dosage and I can’t see if proven caffeine and yohimbe dosages are used.

Safe, effective caffeine dosages are between 100-400 mg. But people who are sensitive to caffeine may experience side effects by taking these amounts.

Yohimbe is possibly unsafe in any dosage; but especially dosages larger than 50 mg. Some people reported rapid heartbeat, kidney failure, seizure, and heart attack after taking yohimbe.[4]

Should You Buy Dexyfen?

Dexyfen holds 56 capsules. Since the recommended dosage is 1 capsule a day, the bottle lasts 56 days. Dexyfen costs $44.99 and is sold by GNC and It seems like a good value, so should you buy?

Dexyfen promises to burn fat, suppress appetite, and boost energy. But only caffeine and yohimbe are proven to produce these results. Too much yohimbe may be dangerous, and I don’t know how much Dexyfen uses. I do know Dexyfen contains thiamin and niacin dosages that may cause side effects. And several users reported side effects.

Although most users say Dexyfen works without causing side effects. I’m unsure about its safety. Try a weight loss pill with safe ingredients and safe dosages instead.


[1] Waluga, M, E Tkacz, et al. “Neuropeptide Y in obese women during treatment with adrenergic modulation drugs.” Medical Science Monitor. 7.3 (2001): 403-6.

[2] Dulloo, AG, CA Geissler, et al. “Normal caffeine consumption: influence on thermogenesis and daily energy expenditure in lean and postobese human volunteers.” American Journal of Clinical Nutrition. 49.1 (1989): 44-50.

[3] Ostojic, SM. “Yohimbine: the effects on body composition and exercise performance in soccer players.” Research in Sports Medicine 14 (2006): 289–99.

[4] “Yohimbe Side Effects & Safety.” WebMD, LLC.

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