Updated Jan 27, 2022.
Published Jan 17, 2018.

Phentatrim is an appetite suppressant. Its main active ingredient is glucomannan which, in clinical trials, has demonstrated a positive effect on weight loss. The ingredient dosage in this supplement is perfectly balanced, it is suitable for vegetarians, and there is a 60-day money-back guarantee. With these factors combined, we feel this makes for an excellent supplement choice.


  • 60-day money-back guarantee
  • Active ingredients are used in the correct, optimum doses
  • Active ingredients have significant clinical support
  • Suitable for vegetarians
  • EFA approved


  • Can cause some mild side effects – including gas and increased bowel movements
The main active ingredient in Phentatrim is glucomannan, which has been clinically proven to aid weight loss in numerous ways, including fat binding, appetite suppression, and blood sugar regulation.

Below we take an in-depth look at Phentatrim to see how this supplement works.

Phentatrim Key Features

Phentatrim is a weight loss supplement that acts as an appetite suppressant and fat binder, and can regulate blood sugar levels. It also contains iodine, which contributes towards optimum thyroid function, which can in turn impact your metabolic rate.

Phentatrim Key Points

  • Manufactured by Optimum Nutra Inc.
  • 180 capsules per bottle
  • Daily serving of glucomannan is equal to the EFSA-approved doses

Phentatrim contains glucomannan, a fibre found in Konjac root, which can absorb up to 50 times its own weight in water. Glucomannan acts to aid weight loss in several ways, including suppressing the consumer’s appetite, delaying the onset of hunger after a meal, binding with some fat and cholesterol in the digestive system (effectively reducing the calorific value of a meal), and regulating blood sugar levels.

Glucomannan’s benefits have been recognised by the European Food Safety Authority (EFSA); they have approved glucomannan as an appetite suppressant and weight loss aid, providing that the daily serving consists of three doses of a gram each – exactly the same dosage that is found in Phentatrim.

Phentatrim Benefits:

  • Main ingredient, glucomannan, is used in clinically proven quantities to effectively suppress appetite
  • Each bottle provides 180 capsules – enough for a 30-day supply of 6 capsules per day!
  • Full 60-day money-back guarantee and free worldwide shipping options

Appetite suppressants generally fall into two broad categories, chemical or hormonal appetite suppressants, and bulk-based appetite suppressants. This product clearly falls into the second category, which generally have fewer and less serious side effects than chemical appetite suppressants, as well as having the benefit of being non-addictive.

How to Take Phentatrim

Directions for use are as follows: Take two capsules with at least one glass of water around 20-30 minutes before a meal, three times a day. Do not exceed six capsules per day. Do not dry swallow glucomannan capsules.

Phentatrim is manufactured by Optimum Nutra Inc., who also manufacture Phentaslim, a Diet Pills Watchdog approved supplement. Customers who want to contact Optimum Nutra can find contact details on the official Phentatrim website; we have previously contacted the company posing as a potential customer with questions about their products, and received a detailed reply back within a couple of hours.

Phentatrim Concerns:

  • Can cause some mild side effects – including gas and increased bowel movements

What does Phentatrim claim to do?

The manufacturers provide the following description of the product’s benefits:

The main ingredient, glucomannan,

acts as the ultimate hunger killer; taken before meals it creates a feeling of fullness.

It also has the following benefits:

  • Improves satiety and destroys appetite hormones
  • Balances blood sugar and lipid levels
  • Improves bowel health
  • Trips sensors in the brain to eat less
  • Feeds friendly bacteria

Chromium helps move sugar out of the bloodstream and then into the cells for effective energy usage.

Iodine is fantastic at regulating thyroid hormones and has added metabolism and energy benefits.

Phentatrim Ingredients

The ingredients found in Phentatrim are detailed below. The ingredient quantities provided are per the total daily serving of six capsules (to be taken in three servings of two capsules).

Konjac root (3000 mg)

Konjac root contains glucomannan, a type of fibre which studies have shown can aid weight loss in numerous ways; it absorbs water in the stomach (as much as fifty times its weight), swells and becomes gel-like in consistency. It suppresses the consumer’s appetite by filling the stomach, and slowing down digestion, especially the emptying of the stomach, which means that it will take longer to become hungry again after eating. The glucomannan-water gel also absorbs some fat and cholesterol, effectively reducing the metabolizable energy content of the meal it is taken with.

Chromium (25 mcg)

This is used primarily to lower fasting blood sugar levels and to lower insulin levels in people who have type 2 diabetes. In terms of its potential effect upon weight loss, it is possible that taking chromium picolinate by mouth for 2 to 3 months might produce a small weight loss of about 1.1 kg. Obviously, this is an incredibly small amount of weight loss, but studies are still inconclusive. It also helps to reduce insulin resistance.

Iodine (90 mcg)

Iodine is used by the body in the synthesis of thyroid hormones in the thyroid gland, which are called triiodothyronine (T3) and thyroxine (T4). The thyroid plays a significant role in the regulation of the body’s metabolic rate, and a deficiency of iodine can lead to an underproductive thyroid which is associated with weight gain and increased difficulty losing weight. The dose of 90 mcg is enough to prevent deficiency, without being too high, which could cause side effects.

Does Phentatrim Actually Work?

Glucomannan has support from numerous clinical studies, and its weight loss claims have been certified by the European Food Safety Authority (EFSA), provided that it is supplemented in three doses of 1 gram daily (a total daily dose of 3 grams). This is the same quantity that is found in a daily serving of Phentatrim, suggesting that it will be more effective than other under-dosed glucomannan supplements.

Glucomannan suppresses the appetite by filling part of the stomach with a thick, viscous gel, which then delays the onset of hunger by slowing the emptying of the stomach. The highly viscous nature of glucomannan also means that some fat and cholesterol gets caught up in the mixture, preventing it from being fully digested and effectively reducing the calorific value of the meal somewhat.

Chromium is proven to aid weight loss, but its effects are tiny and only noticeable in the long run. Doses used in clinical trials vary hugely, but one study showed that carbohydrate cravings were significantly reduced when taking 600 mcg of chromium picolinate daily over an eight week period. If consumers followed up on this reduced level of cravings, and reduced snacking accordingly, then they would find it easier to lose weight whilst using this supplement. Chromium also helps to reduce insulin resistance. Consumers who have insulin resistance, a precursor to diabetes, will have more trouble losing weight because insulin acts as a fat storing hormone. However, this is not the only factor in weight gain and weight loss.

Iodine plays a significant role in the production of thyroid hormones which help to regulate the body’s metabolic rate. Deficiency can result in weight gain, and can make it more difficult to lose weight. Supplementing iodine in small doses could prevent deficiency and help to optimise thyroid function.

In short, Phentatrim’s active ingredients will aid weight loss, and the appetite suppressing qualities will help consumers to stick to a reduced calorie diet without suffering from extreme hunger.

Phentatrim Side Effects

No weight loss supplements are completely side effect free, and Phentatrim is no different. However, drinking enough water throughout the day will minimise the chances of side effects occurring whilst taking Phentatrim.

Chromium picolinate can lower blood sugars levels and as such should not be used by diabetics without first consulting their doctor. Low blood sugar levels can lead to lightheadedness, dizziness, and even fainting. Customers who have not eaten for several hours are more likely to experience these side effects.

Whilst taking glucomannan can cause some side effects, many can be prevented by taking the product correctly, and the most common side effects (experienced initially as your body adjusts to increased amounts of dietary fibre) such as gas and bloating fade after the first few days of use.

Glucomannan works by absorbing water in the stomach, making it very important to drink plenty of water when taking the product and adjust the dosage if problems occur. In rare cases, consumers who do not drink enough water when taking glucomannan may experience constipation and stomach cramps. As glucomannan is a fibre, it is likely that its usage will increase the rate of one’s bowel movements. Diarrhoea could also occur. Those who experience diarrhoea should cease using the product immediately. If you have had intestinal blockages before, or have difficulty swallowing, consult your doctor before purchase.

Glucomannan also affects blood sugar levels. Diabetics should consult their doctor before taking any glucomannan-based product.

Not suitable for pregnant or breastfeeding women. Not suitable for anyone under the age of 18. Do not exceed 6 capsules per day. Always swallow with water. If you have any medical conditions or are taking any medication, consult your doctor before use. Diabetics should consult their doctor before use. Anyone with a history of thyroid problems should consult their doctor before use.

Phentatrim Customer Feedback

There are several reviews on the website from consumers, which are very favourable. It appears that most have experienced significant weight-loss when taking it as directed. If you have tried Phentatrim, please leave a review for the product in the comments below, as this helps other readers to make an informed decision about the supplement.

Phentatrim Money-Back Guarantee

The manufacturers of Phentatrim state that they offer a 60-day satisfaction guarantee.

They state:

If, for any reason, you are not 100% satisfied, please return it within 60 days. We will refund the purchase price minus a handling fee of £10. The original shipping and handling fees are non-refundable. We’ll pay the return shipping cost if the return is a result of our error.

To prevent people from taking advantage of the lengthy returns policy, there are some criteria that customers need to meet. These are clearly laid out on the website, rather than being hidden in lengthy terms and conditions or disguised using legal jargon.

You have contacted us within 60-days of placing your order.
We will refund you if only one bottle has been opened from your order and all the remaining bottles are in a suitable resalable condition*.
All bottles ordered need to be returned, including the used bottle.

Customers need to obtain an RMA number from customer services before sending a return back to the company. The company provide the returns address when you contact them for the RMA number.

Where To Buy Phentatrim


We’ve been informed that there are time-limited savings available. We would advise readers wanting to purchase Phentatrim to check the website for real-time pricing.

Current Offers

  • One bottle costs £39/39€/$49.
  • A three bottle package for £78/78€/$98.
  • A five bottle package for £117/117€/$147.
  • Plus FREE DELIVERY on all orders.

Watchdog Verdict

Overall, Phentatrim appears to be a well-dosed weight loss supplement. The ingredient quantities align with those used in successful clinical trials, especially for konjac root (glucomannan). Obviously, consumers can choose to take the supplement before only one or two meals per day if that aligns with their needs more, but taking Phentatrim three times daily will provide the best results. A lower dose can also be taken in the long term to make weight maintenance easier. Konjac root can also help to lower cholesterol levels, and may help to regulate blood sugar levels which both reduces cravings and helps to prevent diabetes and insulin resistance. Chromium also has a beneficial effect upon blood sugar levels.

Whilst konjac root can cause some side effects, they are mild and studies show that they tend to only last for the first few days of use. If you previously had a low-fibre diet, side effects are more likely, but again, the side effects of taking Konjac root are roughly the same you would expect from increasing your fibre intake from dietary sources. Drinking enough water is also vital to both Konjac root’s effectiveness and to reduce the chances of developing any side effects. It is also important to consider that the side effects of other appetite suppressants, especially those that are chemical-based, can be much more severe than the side effects of Konjac root.

When purchasing Phentatrim, customers are not signed up to any auto-ship programs, which we definitely approve of. The discounts available for purchases of numerous bottles make the product affordable in the long term, and each bottle contains a whopping 180 capsules, enough for a full 30-day supply at the highest daily dosage. Many competitors with similar products that we have previously reviewed include fewer capsules per bottle and so often products will only offer a 10-20 day supply per bottle. The manufacturers also offer free international shipping on all purchases.

We highly recommend Phentatrim to our readers as an effective appetite suppressing weight loss aid that is stimulant free.

Official Website

Disclaimer: Our reviews and investigations are based on extensive research from the information publicly available to us and consumers at the time of first publishing the post. Information is based on our personal opinion and whilst we endeavour to ensure information is up-to-date, manufacturers do from time to time change their products and future research may disagree with our findings. If you feel any of the information is inaccurate, please contact us and we will review the information provided.

Have Your Say

11 comments on 'Phentatrim'

  1. Hi can you get this product in powder base as I can’t swallow big tablets iv got a heart condition also so is it safe to try these for weight loss?Iv tried juice plus and have actually put weight on since starting them so I’m looking for the best diet pill thanks

  2. I’M TAKING 2 DIFFERENT BLOOD PRESSURE MEDICATIONS. i’M 50 POUNDS OVERWEIGHT. I STOPPED TAKING HORMONE REPLACEMENT 10 YEARS AGO DUE TO FAMILY HISTORY OF BREAST CANCER. Slowly, the weight started coming on plus it’s also due to hereditary factors. I’m 63 years old, work a full time job, an Hispanic, and somewhat active. Do you feel that I am a suitable candidate for this supplement?

  3. Oh darling, I feel your pain. I don’t move a lot, chronic back pain and diabetes and other stuff like living in a country where you can get shot just by going to the store to buy a melon. I got some of these pills and I’ll tell you the truth now, God as my witness, I’m eating less cookies. Kinda motivates me. Darl x

  4. Doc thinks I got the diabetes and I’m okay with these meds. You sound good to go if you got you nothing wrong with you, like ya say. Unless yo hiding something. Lol, I’m kidding, Darl x

  5. Oh I don’t know Jackie, God bless you, I would ask your doc, you gotta be careful having had you there a stroke. I think you’d be okay but don’t take my word. I got diabetes. Not official, but doc thinks so, I’ve been tested waiting for the results now. Check with your doc, honey. Darl x

  6. Hey there, I got these and there’s no caffeine in these pills. You get caffeine in energy booster pills, these are made to make you eat less. Kinda working for me, I’m eating less cookies. Still fat, but not as fat, cause I’m eating less cookies! If I was to get my ass moving about a bit more I could lose some more weight. Ain’t never gonna be next top model slim, I accept that, but gotta get myself looking better or my man gonna stray. He’s a roving eye sorta s.o.b. and when I’m slim I might ditch his cheating ass anyway!! Said he went bowling last week with a pal. What kinda bowling game takes all night and requires an overnight stay in a motel? Darl x

    1. You are like a breath of fresh air, my love. I am just about to order some of these tabs, so wish me luck please. Lindy x

  7. Hi, I’m 69 years old , had a stroke last year….I’m on a lot of different medication for blood pressure, heart and other problems, would this be ok to take ?

  8. Hey,i have desgenerated disk problems and high blood pressure, as to not being able to move alot i feel im putting on alot of weight and its getting me very low in my moods,i was wanting to ask if this would be good or would there be a problem with my medication.Thanks Deborah.

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