Astral Nutrition Overpwr

Updated Nov 5, 2021.
Published Aug 3, 2018.

The main ingredient in Astral Nutrition Overpwr is glucomannan, which has genuine scientific approval as an appetite suppressant. We love to see this ingredient included in a supplement, as you just know it’s going to be effective. Astral Nutrition is a quality company with a great range, plus they offer a money-back guarantee on all their products – which just goes to show they have total faith that the supplements will work.


  • Easy to take
  • Contains glucomannan – a proven appetite suppressant
  • Contains no stimulants


  • Levels of glucomannan are low
  • Expensive if the full dose is taken
Astral Nutrition Overpwr
Astral Nutrition Overpwr is a weight loss supplement that suppresses the appetite and promotes feelings of fullness. It is stimulant free, meaning it can be taken at any time of the day. Overpwr contains glucomannan as the principle ingredient, and at first glance, it looks pretty good.

We take an in-depth look at Astral Nutrition Overpwr to see if it really could help you to lose weight and if it’s safe to take.

Astral Nutrition Overpwr Overview

What you need to know about Astral Nutrition Overpwr

Astral Nutrition Overpwr is an appetite suppressant that uses glucomannan as the main ingredient, alongside numerous B vitamins, calcium, and chromium.

It comes from the British supplements company, Astral Nutrition, who are based in the North of England and who manufacture a range of products that target weight loss and bodybuilding, as well as health and beauty.

What are the side effects of Astral Nutrition Overpwr?

Glucomannan works by absorbing water in the stomach. It is really important to drink plenty of water when taking the product to avoid constipation and stomach cramps, not to mention choking if it expands before reaching the stomach. As glucomannan is a fibre it is likely that its usage will increase the rate of bowel movements. Diarrhoea may also occur. Glucomannan also affects blood sugar levels. Diabetics should consult their doctor before taking any glucomannan-based product.

How much does Astral Nutrition Overpwr cost?

It costs £34.99 for one bottle of 60 capsules, which could last as little as 20 days if the full dose is taken. It works out a lot better if only one capsule per day is taken and will then last for 60 days, however the effects will be particularly minimal at that dosage. You’d actually need to double up on the full dose to get the recommended 3000mg of glucomannan per day.

Multiple-bottle packages are also available on the Astral Nutrition website, at £79.99 for three bottles, and £134.99 for five bottles.

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Astral Nutrition Overpwr Key Features

Astral Nutrition Overpwr is a weight loss supplement based on glucomannan. This is a naturally absorbent fibre derived from a plant extract called Konjac root. Glucomannan absorbs water, making it form into a gel. When you ingest this substance, it expands in the stomach like a sponge, causing you to feel fuller and satisfied for longer. According to research, glucomannan helps maintain normal blood sugar levels, manages cholesterol, and has other medical benefits too.

Astral Nutrition Overpwr Key Points

  • Each bottle contains 60 capsules
  • Made in the UK
  • Comes with a money-back guarantee

It does not cause jittery side effects that are often associated with weight loss products that are stimulant-based, so it can be taken at any time of the day.

How to Take Astral Nutrition Overpwr

  • Use Overpwr as and when hunger strikes. Take one to three pills (depending on hunger intensity) with 400ml of water when you experience unwanted hunger cravings. Ensure you consume the correct amount of water with the serving, otherwise it may not be effective. Do not exceed six capsules per day.

Glucomannan is one of the few substances that the European Food Standards Agency (EFSA) has recognised as effective for weight loss support, so there is actual evidence that it works.

The product also contains multiple B vitamins and chromium for added support.

Astral Nutrition Overpwr Concerns:

  • Contains inadequate amounts of glucomannan
  • Works out expensive to take the effective amount of glucomanna

The product is manufactured by Astral Nutrition, a company based in the UK who claim to give their customers the tools to push past their limitations. The company offer both weight loss and weight gain supplements, in the form of fat burners, appetite suppressants, and shakes.

Astral Nutrition does offer a money-back guarantee, however it does come at a cost, with you losing on a £6 admin fee for processing your return.

What does Astral Nutrition Overpwr claim to do?

Astral Nutrition Overpwr claims to help you to lose weight by suppressing the appetite, promoting a feeling of fullness, countering hunger, and reducing fatigue. It is said to work in 5-10 minutes.

Does Astral Nutrition Overpwr work?

Overpwr will work as described if you take a high enough dose to get the effective amount of glucomannan. All of the clinical evidence has been based on a daily serving size of 3000mg a day, but this supplement only provides 1500mg at the maximum dosage, so you’d have to double up on the dose (and the price).

phentatrim bottle
The most popular appetite suppressant in 2023 is Phentatrim.

Its ingredients are scientifically proven to aid weight loss and you are covered by a full 60-day money-back guarantee from a trusted company, making Phentatrim a very popular choice in the diet world.

Phentatrim is the best thing to hit the supplement market in a long time, with thousands of customers already seeing the benefits. That’s why it's our editor's top pick.

Read the Watchdog Phentatrim review here.

Astral Nutrition Overpwr Ingredients

  • Glucomannan Konjac 500mg: Natural dietary fibre made from the root of the Konjac root which grows naturally in Asia. The root is often used as a dietary thickener in the food industry, but these days is becoming well known as a weight loss aid. The fibre has a prebiotic effect in that it feeds the good bacteria in the intestine and so can be beneficial for health, including cardiovascular health, gut health, and stress. Glucomannan is often used as a remedy for constipation, which is typical in people with a low fibre diet. It is a bulk-forming laxative, which means that it causes the bowels to open because of the fibre content unlike laxatives such as Senna that irritate the gut lining. It is also useful for diabetics because it delays the stomach’s natural emptying process, which leads to more gradual sugar absorption and lowers blood sugar levels after meals. Effective serving size is 3000mg a day. Source
  • Vitamin B1 10mg: Also called Thiamine. Vitamin B1 is found in many foods including yeast, cereal grains, beans, nuts, and meat. It is required by our bodies to properly use carbohydrates.
  • Vitamin B2 10mg: Also known as Riboflavin. It is involved in many processes in the body and is necessary for normal cell growth and function. It can be found in certain foods such as milk, meat, eggs, nuts, enriched flour, and green vegetables.
  • Vitamin B3 10mg: Also known as Niacin. A vital vitamin that is necessary for every cell in your body and plays a role in regulating metabolism. B3 deficiency slows the metabolism. Too much vitamin B3 can cause common side effects such as skin flushing and skin irritation.
  • Vitamin B5 10mg: Also known as Pantothenic acid. It is widely found in both plants and animals including meat, vegetables, cereal grains, legumes, eggs, and milk.
  • Vitamin B6 5mg: Has several important functions in the body, including allowing the body to use and store energy from protein and carbohydrates in food. Whilst taking excess amounts of vitamin B6 will not infinitely improve this ability, a deficiency could make it more difficult to lose weight. Source
  • Vitamin B12 125mcg: Naturally present in many foods. It has several roles, including aiding in releasing energy from consumed food and keeping the nervous system healthy. It may be that a deficiency hinders weight loss, but taking excess amounts could be potentially harmful. Source
  • Chromium 100mcg: Chromium is a trace mineral that may help the body regulate blood sugar. A usual serving size is between 50mcg and 200mcg.
  • Calcium 890mcg: Calcium has also been shown to have appetite-suppressing abilities, as well as being able to boost the metabolism.

Astral Nutrition Overpwr Side Effects

The principle ingredient, glucomannan, is generally safe, but can cause some mild side effects of consuming fibre such as:

  • Diarrhoea
  • Gas
  • Bloating
  • Abdominal discomfort

It is important to take glucomannan with plenty of water, so that it can expand safely in the stomach where it does not cause any type of blockage.


Do not use if pregnant or breastfeeding. Not for use by persons under the age of 18.

Astral Nutrition Overpwr Customer Feedback

There are some reviews on Amazon, the majority of which are very positive.

An example of a positive review includes:

this really works for me as have tried many different products before that have filled me out but i wanted an appetite suppressant to stop me picking at food and this works better than the other products

Negative reviews mostly say that the product has done nothing at all:

Speedy delivery. Product not effective at all with me! Very disappointing

Astral Nutrition Overpwr Money-Back Guarantee

Yes, Astral Nutrition does offer a money-back guarantee. However, they do not refund your shipping costs for the delivery or the return, and they also take an ‘admin fee’ of £6, so you will be losing out on quite a bit of your money even if the product does not work for you.

They say:

Your refund will be the total amount paid, minus the cost of shipping and minus a small handling admin fee of £6. If you received free shipping on your order, our incurred shipping cost will still be deducted from the final value. We will not be able to reimburse the cost of returning the products.

Where To Buy Astral Nutrition Overpwr

You can buy it from the official website for £34.99 for 60 capsules, as well as at a reduced price for multiple-bottle orders.

Watchdog Verdict

We really like glucomannan as a weight loss aid; it can work for those who are sticking to a healthy diet, and it can have a beneficial effect on blood sugar and cholesterol levels.

Glucomannan is a very good principle ingredient. However, even with the maximum dose of three capsules, you are only getting half of the recommended quantity you need per day, so you would have to double-down on the dose (as well as the price) to get the full effect.

How does Astral Nutrition Overpwr compare to Phentatrim?

Criteria Astral Nutrition Overpwr Comparison Phentatrim comparison
Clinically Proven Ingredients
Side Effect Free
Positive Customer Reviews
24/7 Support
Money-back Guarantee

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.

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