What are the best diet pills in 2020? A buyer’s guide

best diet pills in 2020

Looking for help losing weight? Then you’re probably wondering, “what is the best diet pill on the market?”

And it’s a fair question. With so many products to choose from, finding the best diet pills – diet pills that actually work – can be tricky.

There are tons of guides out there that claim to help you find the best weight loss pill, but they’re often light on selection criteria. What makes a prescription diet pill better than a prescription one, for example? And what does a diet pill have to do right to get the top spot?

We’ve written this guide to make things a bit clearer. We’ll introduce five categories of diet pill and tell you our top pick for each, along with the reasons that made the cut.

What determines the best diet pill?

Ultimately the answer to this question is “how well it aligns with your weight loss goals” – and this is something a lot of best diet pill articles forget.

A gym-warrior who wants to gain muscle while shedding pounds has a completely different set of needs to a stay-at-home mum who’s curious about diet pills and maybe wants to lose a little bit of weight.

That’s why this guide introduces diet pills by the category they fit into.

Another thing that sets the best diet pills apart from the other supplements on the market is whether they work. Sadly some of the companies that make weight loss pills have no qualms about putting a product to market that doesn’t deliver what it promises or, worse, delivers nothing at all.

To make sure you don’t throw any money down the drain in pursuit of your weight loss goals, we’ve only included diet pills that work.

So, what are the categories of diet pill this article will cover? As we said, there are five. Each aligns with a common weight loss goal.

  1. The best diet pill on the market in 2020 – This is the pill that ticks all of our boxes. A number of products can fit the bill for “best” depending on your specific physiological needs, but our best is based on reviews, formula, and the manufacturer.
  2. The best diet pill for energy – This diet pill is designed to fire up your energy levels and help you smash your exercise routine. If you thrive on an active lifestyle, this one’s for you.
  3. The best diet pill for women – Women looking to lose weight face a male-dominated marketplace, so we’ve cut through the chaff and found the options that will deliver the best benefits for you.
  4. The best diet pill for men – Men looking to lose weight have hundreds of products to sift through, which can be overwhelming and confusing. We think this recommendation is the best pill available for men.
  5. The best diet pill for belly fat – A lot of people want to trim belly fat as a weight-loss priority. Here’s how to do it.

Before we dive into our best diet pills review, a quick disclaimer: Diet pills will not help you to lose weight if you aren’t already making lifestyle changes that lead to weight loss. Diet pills are supplements that support other weight loss and claim to improve the results you see. Taking a diet pill alongside a healthy lifestyle can help you to lose more weight than you would otherwise, but they will not magically cause weight loss on their own.

The best diet pill on the market in 2020

  1. When we factored in different criteria such as efficacy, dosing, popularity, and safety, we found Leanbean to be the best diet pill right now.
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This supplement, made by lifestyle company Ultimate Life, regularly tops lists of popular diet pills. And with good reason.

The Leanbean formula is built around a clinically proven dose of glucomannan (3g) – a soluble fibre that suppresses appetite and helps you to eat less as a result. 

By helping you to ingest fewer calories, this diet pill paves the way for some impressive weight loss results.

Glucomannan is supported by a handful of other effective weight loss ingredients. There are vitamins to help prevent deficiencies linked to obesity, minerals to boost your body’s natural metabolism and help burn off fat more easily, and thermogenics to raise your temperature slightly and burn even more calories.

It’s got it all: Sensible formula grounded in science, all-natural ingredients, positive reviews across the board, and more. This is a diet pill that works – and here’s the proof:

Anette from Hungary rates Leanbean 5 stars and says that despite having a sensitive body, she’s never experienced any negative side effects from Leanbean. Instead, it helped to reduce her bloating and transform her body.

Rebecca from Germany is another success story and another 5-star review. She saw the pounds start to fall off when taking Leanbean as directed, and didn’t experience any negative side effects – like shaking, jittering, and anxiety – that other diet pills had caused.

The best diet pill for energy 

  • The best diet pill for energy is Powher Fat Burner. If you like hitting the gym, this diet pill is for you.

What makes the Powher Fat Burner so special? First up, this diet pill also includes 3g of glucomannan – a clinically-proven dose of an ingredient renowned for its weight loss abilities.

The precision dosage doesn’t stop there, though. A daily dose of Powher contains 100mg of caffeine: Just the right amount to provide a boost to your energy, alertness, motivation, and focus – without causing any of the nasty side effects.

Caffeine doesn’t just provide energy. As we said above it provides all the things you need to work out harder and longer. Many studies have proven that caffeine increases workout duration and intensity: Both of which will help you shed the pounds, whether you work out at the gym, the park, or your apartment.

What’s more: The Powher Fat Burner can stack with a pre-workout supplement and a sleep supplement from the same range. Perfect if you’re looking for a holistic approach to weight loss rather than just a diet pill.

The best diet pill for women

  • Leanbean is the best diet pill for women – hands down.

We know Leanbean has featured previously, but we can’t not include it again. For women looking to lose weight, you really can’t do much better than Leanbean.

Although men can take this supplement too, the formula has been hand-crafted to fit the specific needs of the female physiology. 

The cravings that women are scientifically proven to experience more than men? Crushed by the clinically-proven dose of glucomannan in each serving.

The deficiencies that women are more likely to experience than men? Stamped out by vitamins and minerals in doses that keep the levels where they need to be.

The caffeine jitters that women are more susceptible to than men? Gone. This supplement isn’t packed full of caffeine – instead, energy is provided by vitamins that reduce fatigue.

In short, if you’re a woman looking to lose weight, this diet pill for women has got you covered from all angles.

The best diet pill for men

  • PhenQ is the best diet pill for men. Here it is:
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And here’s why it’s the best:

This diet pill supports weight loss from five angles at once.

First is boosting metabolism to help your body store, transport, and burn fat more efficiently.

Second is stopping fat production. This ties into metabolism by reducing the amount of fat stored around the body.

Thirdly, it suppresses appetite. There’s no glucomannan in the formula – the ingredient that gets our vote for best appetite suppressant – but PhenQ uses chromium picolinate and other ingredients to encourage this effect.

Fourth, it boosts energy. As we said with Powher: More energy means a harder and longer workout, and more calories burned.

And finally, PhenQ supports mood, helping you to feel motivated and uplifted on your weight loss journey.

Men looking for a diet pill to help with their weight loss goals will struggle to find something better than PhenQ.

The best diet pill for belly fat

  • Garcinia Cambogia Extra will help you burn that belly fat.
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This diet pill is built around garcinia Cambogia, as you probably guessed from the name.

Garcinia Cambogia is a plant extract widely studied for its appetite suppressant and mood-enhancing properties. One study found that people lost more weight when taking a diet pill that contained Garcinia Cambogia than a control group.

The formula also contains raspberry ketones: An ingredient linked with supporting your body in burning fat naturally.

Taken together, these ingredients are designed to melt fat from your body when taken as directed. 

Although no supplement can target specific areas of fat in your body, Garcinia Cambogia Extra is well-positioned to help you reduce overall fat levels. Over time this means more fat will be lost from typical problem areas including belly, bottom, and legs. 

What is a diet pill?

A diet pill is a supplement or medication designed to help you lose weight.

Diet pill supplements contain natural ingredients – things like vitamins, minerals, and plant extracts – to support weight loss.

Prescription diet pills often use ingredients whose effects are a bit more intense. These are only available to patients with a prescription, or on advice from their doctor.

Diet pills are designed to support weight loss, not to be its sole cause. They integrate into a lifestyle built around a healthy diet, regular exercise, and an overall caloric deficit.

When taken as directed, alongside a lifestyle like the one outlined above, diet pills can augment the weight loss results you’d normally see.

The best diet pills align with your goals and support you to see improved weight loss outcomes. 

Many diet pills – whether supplements or prescription medicines – are built around one or more of several popular mechanisms of action. We’ll flesh these out in the next section, but to briefly introduce them:

  • Appetite suppression: To help you eat less.
  • Metabolism boost: To help your body burn and store fat efficiently.
  • Thermogenesis: To raise your temperature and burn more calories.
  • Energy boost: To give you more energy, focus, and motivation to work out.
  • Reduction of fat absorption: To help your body remove more of the fat from your diet.

Let’s take a deeper look at each.

How do diet pills work?

Diet pills work by supporting your body to store less of the fat you consume, burn more of the fat that’s stored, and absorb less of the new fat from your diet.

Here are the key mechanisms of action.

Appetite suppression

When you’re hungry, you eat. The food you eat contains all sorts of macronutrients, including fat, which your body breaks down and ships off to wherever they’re needed.

Fat is used as a fuel source to provide energy. It’s healthy to have fat in your diet, but problems can start when you have too much.

Because a lot of people consume too much dietary fat, many diet pills include appetite suppressants to help you eat less, and less often.

Crushing cravings means less snacking between meals, and promoting feelings of fullness help you to eat small portions. Taken together this means less fat consumed, and less fat to be stored around your body as a result

Metabolism boost

Metabolism refers to the processes by which your body breaks down, transports, stores, and uses the nutrients you consume. 

Efficient metabolism means your body is better able to transport fat from store to be used as fuel when your body needs it. By supporting your body’s metabolism, diet pills look to encourage more fat to be burned as fuel, and less to be stored as fatty deposits around the body.

Some diet pill ingredients also support macronutrient metabolism, meaning vitamins and minerals are used more efficiently as well as just fats.


By raising your internal temperature slightly (within safe limits), diet pills look to help you burn more calories at rest than you would otherwise.

When you’re losing weight, any calories burned will contribute to the results you see. Regular exercise is the best way to burn calories, but burning a few extra while at rest will bump up your daily total slightly.

Thermogenics can work while you’re asleep as well, and some diet pills take advantage of this to help you burn fat while you sleep.

Energy boost

Working out takes energy – that’s no secret.

Many diet pills include caffeine or other natural sources of energy to give you more workout fuel. As we said earlier: Diet pills that work are the ones that align with a healthy lifestyle. That’s why good diet pills promote and encourage exercise and physical activity, rather than just claiming to help fat melt away.

Keep an eye on caffeine levels: Some supplements are chock-full of the stuff, and high doses can trigger jitters and anxiety in people with low thresholds. That’s why our best diet pill for caffeine contains 100mg per day: Enough to be effective, but not too high that it will cause side effects.

Reducing the amount of fat absorbed

Prescription diet pills often look to reduce the amount of fat your body absorbs from the foods you eat. This is slightly different from the goals of appetite suppression, which aim to help you eat less.

By reducing fat intake, these diet pills help fat not to be digested at all. It is removed from your body as waste rather than being stored in fat deposits.

Because of the nature of these ingredients, it’s important to have supervision from a medical professional. There are some over-the-counter diet pills that use this mechanism, but the majority require a prescription.

Common diet pill ingredients 

What ingredients can you expect to find in diet pills that work?

One thing you’ll notice is that diet pills have all sorts of ingredients. You’ll see vitamins, minerals, plant extracts, and funky chemicals with scientific names like L-Tyrosine.

The most important piece of advice we can give is to look into the ingredients in a diet pill before you take it. Knowing what you’re taking into your body affords peace of mind, and it gives you the knowledge to gauge whether a manufacturer’s claims are made in good faith.

Here are some ingredients to keep an eye out for. They are diet pill ingredients that work, and are often underpinned by science:


A soluble fibre extracted from the konjac plant that expands when exposed to water, helping you to feel full more quickly and eat less as a result. Scientifically proven to be effective for weight loss in energy-restricted diets, with health safety authorities identifying 3g as the optimal daily dose.

(So, bonus points to diet pills like Leanbean that include 3g per day.)

Garcinia cambogia

Another plant extract that’s widely studied for its weight loss outcomes. It contains high amounts of hydroxycitric acid, an ingredient linked to appetite suppression, reduced fat absorption, and more.

Many human studies have linked garcinia Cambogia to improved weight loss outcomes.


An ingredient known for its impact on lipid metabolism (lipids are fats), that features a lot in diet pills thanks to the support it offers.

By streamlining your body’s lipid metabolism, ingredients like choline mean more fat is burned for fuel and less is stored in fat deposits around your body.


This mineral is linked to reductions in tiredness and fatigue, meaning it may raise your energy levels and facilitate a longer, harder workout.

Deficiencies in magnesium are also more prevalent in overweight people, meaning that supplementation may be linked with the prevention of weight gain.

B vitamins

Vitamins B6 and B12 are frequent fixtures in diet pill formulas. Both are linked to reductions in tiredness and fatigue, meaning they’re featured for the same reason as magnesium.


A mainstay in the formulas of diet pills that work, caffeine is the most famous energy-boosting ingredient in the world.

By choosing a diet pill with caffeine you’re giving yourself the fuel to burn more calories at the gym, and to keep the pounds away.

Who should buy a diet pill? 

Diet pills are a great choice for people looking to supplement the weight loss outcomes they see from a healthy diet and regular exercise.

If you don’t have a healthy diet or regular exercise, making lifestyle changes alongside deciding to take a diet pill is vital. A diet pill by itself won’t help, but they will boost the results you see from lifestyle changes.

The most simple answer to “who should buy a diet pill” is “anyone looking to lose weight.” Because of the variety in the marketplace, the wealth of ingredients and formulas available, and the different categories available, you can find a diet pill to align with almost any weight loss goals.

So if you’re looking to lose more weight than you would without a supplement, a diet pill could help. This article reviewed five of the most popular diet pills in 2020, but there are tons more available. We recommend doing your research and familiarising yourself with what’s available, and not being afraid to try another pill if the first one doesn’t work as expected. 

This is the best way to find a diet pill that works for you. 

Diet pill FAQs 

Here are some commonly asked questions about diet pills. 

Are diet pills safe?

Yes, diet pills are safe when taken as directed. Each diet pill contains instructions on how to take it – follow this to the letter. Exceeding daily doses can lead to side effects, and this applies when taking more than one diet pill at once.

If you’re planning to take multiple brands of diet pill together, triple-check that you’re not going over the recommended daily doses for any ingredients. We recommend checking this with a doctor, too.

Are diet pills legal?

Yes, diet pills are legal. The majority of diet pills are supplements, meaning they are available to buy without a prescription. Being in possession of a prescription diet pill without medical permission may cause trouble: We strongly advise against taking a prescription pill without medical need.

Are diet pills effective?

Yes, diet pills can be effective when taken as directed and as part of a lifestyle that facilitates weight loss. If you exercise regularly and eat healthily you will burn more calories per day than you consume, and weight loss will follow. A diet pill can help to boost these results.

Are diet pills healthy?

Yes, when taken as directed, diet pills are healthy. We can’t answer for every single product and encourage you again to do your own research, but the vast majority of diet pills contain naturally occurring vitamins, minerals, and plant extracts that are healthy in the doses sold.

Are diet pills a stimulant?

No, diet pills are not themselves stimulants. Some diet pills contain stimulant ingredients like caffeine, which will give an energy boost. If you’re concerned about stimulant ingredients, choose a diet pill with none in the formula, or speak with a doctor about your options.

Do diet pills affect birth control?

Yes, some of the ingredients in diet pills can have unexpected impacts on birth control. We recommend double-checking each product, and making sure that you’re happy with the ingredients and expected outcomes before taking it.

This is true for women who are pregnant or nursing, too.