7 Best Diet Pills (2024 Updated) Lose Weight Fast

Lisa Lorraine Taylor, BSc, CPT
Published by Lisa Lorraine Taylor, BSc, CPT | Staff Writer
Last updated: February 1, 2024
FACT CHECKED by Dr. Kristy Dayanan, BS, MD
We personally test every product featured in our reviews and guides. By ordering products anonymously and getting a group of independent testers, we are able to get first-hand experience and provide data-driven recommendations. Learn more.

People who are having difficulty getting their bodies to burn fat through diet and exercise only may benefit from taking weight loss pills containing natural ingredients in clinically proven dosages.

As a certified personal trainer, together with my team, I researched and tested hundreds of supplements to determine which diet pills perform best for people as natural weight loss solutions.

In this review, we will share our top seven natural supplements that proved to be most effective in our practice with clients over the years, and we will reveal which one provided the quickest fat-burning process with the fewest side effects.

The Best Diet Pills

Editor's Choice
PhenQ
PhenQ
Rated 4.8/5
Click For Best Price
2nd Best Choice
PhenGold
PhenGold
Rated 4.7/5
Click For Best Price
3rd Best Choice
Instant Knockout Cut
Instant Knockout Cut
Rated 4.7/5
Click For Best Price

Our Top Diet Pills in (June 2024)

1 - PhenQ (Best Overall & for Men)

Rated 4.8/5
4.9
Ingredients
4.6
Price
4.7
User Ratings
4.8
Product Effectiveness
PhenQ
  • Price per serving : $2.33
  • Key ingredients : α-Lacys Reset®, Capsimax Powder, caffeine, chromium picolinate, nopal cactus
  • Proprietary Blends : Yes
  • Third-party tested : Not mentioned

Pros and Cons

Pros

  • Clients report improved athletic performance through increased energy levels
  • Can help strengthen bones due to its high calcium content
  • All of the ingredients have been scientifically proven to aid in weight loss
  • Risk-free due to its 60-day money-back guarantee

Cons

  • It is only available for purchase through the company's website

Who is it for?

Who is it for?

  • People seeking improved athletic performance.
  • Those needing a strong appetite suppressant.

Who is it not for?

  • Individuals who prefer buying in-store rather than online.

Final Verdict

PhenQ offers a comprehensive approach to weight loss by boosting energy and suppressing appetite, making it a top choice for men looking for fast results. Its availability exclusively online may limit some buyers.

Our team reviewed and ranked PhenQ as the best weight loss supplement on the list because it gave us the best weight loss results during our testing in the shortest amount of time with no unwanted side effects.

According to the study found on the National Center for Biotechnology Information website, this helps the body boost metabolism and promote fat burning [1].

Furthermore, the sufficient amount of caffeine and L-carnitine in this diet supplement can boost energy levels, reduce appetite, and improve mood, allowing you to perform better during workouts [2] [3].

“L-Carnitine is an essential nutrient in lipid metabolism, which promotes the transportation of long-chain-fatty-acids across the mitochondrial membrane, thus allowing the cells to break down fat and release energy from reserves of stored fat.”

- Jun-jie Zhang, Associate Professor at Sun Yat-Sen University

 

Supplement Facts:

2 - PhenGold (Cheapest & Best for Mood)

Rated 4.7/5
4.7
Ingredients
4.8
Price
4.6
User Ratings
4.7
Product Effectiveness
PhenGold
  • Price per serving : $2.00
  • Key ingredients : Green tea, green coffee, L-theanine, L-tyrosine, Rhodiola rosea, cayenne pepper, caffeine
  • Proprietary Blends : No
  • Third-party tested : Not mentioned

Pros and Cons

Pros

  • Well-balanced ingredients backed up by scientific research
  • Promotes rapid post-workout recovery
  • Helps in the improvement of mood and brain functions

Cons

  • May not be good for people who are sensitive to stimulants

Who is it for?

Who is it for?

  • Individuals looking for mood enhancement.
  • Those wanting a budget-friendly option.

Who is it not for?

  • People sensitive to stimulants.

Final Verdict

PhenGold balances affordability with effectiveness in mood enhancement and cognitive support, ideal for sustained use. Its stimulant content may be too intense for some.

PhenGold could be a good choice for people who want to achieve healthy weight loss by boosting metabolism and improving cognitive abilities without having to worry about side effects.

Rhodiola Rosea and L-tyrosine may improve physical performance through improved focus and concentration [4].

Also, the green coffee beans in this weight loss supplement have anti-inflammatory properties, which may help the body recover faster after exercise [5].

After consuming PhenGold for four weeks, most of my clients could work out for an extra hour because they had more energy and better concentration.

Supplement Facts:

3 - Instant Knockout Cut (Best Appetite Suppressant & for Bodybuilding)

Rated 4.7/5
4.8
Ingredients
4.6
Price
4.7
User Ratings
4.7
Product Effectiveness
Instant Knockout Cut
  • Price per serving : $2.17
  • Key ingredients : Green tea extract, cayenne powder, glucomannan, caffeine, vitamin B6, vitamin B12
  • Proprietary Blends : No
  • Third-party tested : Not mentioned

Pros and Cons

Pros

  • May help in boosting metabolism
  • Helps enhance mood and concentration
  • Can significantly reduce appetite

Cons

  • Caffeine-sensitive individuals may experience jitters and insomnia

Who is it for?

Who is it for?

  • Fitness enthusiasts needing appetite control.
  • Bodybuilders looking for fat loss support.

Who is it not for?

  • Those sensitive to high caffeine levels.

Final Verdict

Instant Knockout Cut excels in supporting rigorous physical training and appetite control, making it suitable for athletes and bodybuilders. It may not be suitable for those sensitive to stimulants.

Don't let the aggressive packaging mislead you into thinking that this potent diet pill is only for men. The Instant Knockout Cut is designed for anyone who works out hard, male or female.

This effective weight loss pill contains a high amount of the dietary fiber glucomannan, which helps prolong feelings of fullness [6]. Furthermore, the added Vitamin D3 can help with lean muscle mass gains as well as muscle and bone strength-building [7].

My clients have noticed a significant increase in energy and strength after taking this weight loss pill for about a month.

Supplement Facts:

4 - Transparent Labs Fat Burner

Rated 4.6/5
4.6
Ingredients
4.5
Price
4.6
User Ratings
4.6
Product Effectiveness
Transparent Labs Fat Burner
  • Price per serving : $0.92
  • Key ingredients : Green tea extract, Forslean, caffeine, L-theanine, cayenne pepper
  • Proprietary Blends : No
  • Third-party tested : Yes

Pros and Cons

Pros

  • No proprietary blends
  • May help speed up fat metabolism
  • Helps reduce post-workout fatigue

Cons

  • Some consumers experienced indigestion during the first week of use

Who is it for?

Who is it for?

  • Individuals seeking a stimulant-free option.
  • Those needing help with post-workout recovery.

Who is it not for?

  • People who prefer supplements with common ingredients.

Final Verdict

Transparent Labs Fat Burner provides a unique blend of ingredients for those who want to avoid common stimulants and need enhanced recovery after workouts. Its unique ingredient list might be less appealing to some.

One of the best weight loss pills available today is a fat burner from Transparent Labs, which contains unique ingredients that aren't found in any of the other supplements on the list.

Take, for example, synephrine and 5-HTP. Transparents labs included these ingredients in their formula so that they could work in synergy to reduce appetite without affecting mood levels, allowing you to eat fewer calories without losing motivation to work out every day [8] [9].

“Therapeutic administration of 5-HTP has been shown to be effective in treating a wide variety of conditions, including depression, fibromyalgia, binge eating associated with obesity, chronic headaches, and insomnia.”

- Timothy C. Birdsall, Doctor of Naturopathic Medicine

While taking this fat-burning supplement, my clients and I could extend our workout routine without getting too tired.

Supplement Facts:

5 - Trimtone

Rated 4.6/5
4.7
Ingredients
4.6
Price
4.5
User Ratings
4.6
Product Effectiveness
Trimtone
  • Price per serving : $1.67
  • Key ingredients : Caffeine, green coffee, green tea, glucomannan, grains of paradise
  • Proprietary Blends : No
  • Third-party tested : Not mentioned

Pros and Cons

Pros

  • May help prevent weight gain by balancing hormones
  • Increase the rate of normal fat metabolism
  • Worry-free purchase due to its 100-day-money-back guarantee

Cons

  • Some consumers didn’t lose weight

Who is it for?

Who is it for?

  • Women looking for hormone balance and weight control.
  • Those interested in a once-a-day dose.

Who is it not for?

  • First-time users prone to digestive issues.

Final Verdict

Trimtone is specifically formulated for women, promoting hormonal balance and effective weight management with a convenient once-a-day dosage. Its composition may cause stomach discomfort in new users.

With one capsule of Trimtone per day, women can supplement their workout and lose body weight faster while also maintaining their hormonal balance and controlling their diet.

Many of my female clients who took Trimtone for three months reported a significant improvement in their general well-being, which helped them maintain their workout schedules.

Supplement Facts:

6 - PrimeShred

Rated 4.5/5
4.6
Ingredients
4.4
Price
4.5
User Ratings
4.5
Product Effectiveness
Primeshred
  • Price per serving : $2.00
  • Key ingredients : Green tea extract, L-tyrosine, Rhodiola rosea root, caffeine, cayenne pepper, DMAE
  • Proprietary Blends : No
  • Third-party tested : Not mentioned

Pros and Cons

Pros

  • May help you stay motivated by providing you with more energy
  • Reduces post-exercise fatigue
  • Assists with lean muscle mass growth

Cons

  • The high dose of stimulants in these supplements may cause palpitations in caffeine-sensitive people

Who is it for?

Who is it for?

  • Fitness enthusiasts looking to enhance muscle mass and focus.
  • Those needing an energy boost during workouts.

Who is it not for?

  • People who are sensitive to high levels of stimulants.

Final Verdict

PrimeShred is designed to support muscle growth and mental focus during intense workouts, providing a significant energy lift. However, its high stimulant content may be overwhelming for caffeine-sensitive users.

Finally, if you're a fitness enthusiast looking for an effective weight loss supplement to help increase muscle size and strength, Prime Shred may be your best choice.

After four weeks of use, my clients and I have felt a significant boost in energy and focus, which has helped us stay motivated and feel less tired after training.

"We've shown that green tea is able to increase your energy expenditure — so the amount of calories you burn — and also to increase the amount of fat you are burning."

- Rick Hursel, School for Nutrition, Toxicology & Metabolism, Maastricht University

 

Supplement Facts:

7 - LeanBean

Rated 4.4/5
4.5
Ingredients
4.4
Price
4.4
User Ratings
4.4
Product Effectiveness
Leanbean
  • Product no longer available for sale.

Pros and Cons

Pros

  • May help with mild energy and mood enhancement
  • Reduced food intake due to decreased appetite
  • Promotes overall well-being

Cons

  • First-time users may experience stomach discomfort

Who is it for?

Who is it for?

  • Women seeking appetite control and minor energy boosts.
  • Those looking for holistic weight management.

Who is it not for?

  • Individuals looking for immediate, aggressive weight loss results.

Final Verdict

LeanBean supports gradual and sustainable weight loss for women, focusing on appetite suppression and well-being enhancement. It's not suited for those seeking rapid weight loss solutions.

LeanBean, regarded as the best weight loss pill for women, has shown positive results in our review. Female clients experienced a significant appetite reduction after just 14 days, leading to lower food intake and gradual weight loss over 90 days.

Unfortunately, LeanBean is currently out of stock. As an alternative, Capsiplex Trim is recommended. It offers benefits such as enhanced fat burning, increased metabolism, and appetite reduction, specifically designed for women's weight management needs.

Supplement Facts:

How We Tested Best Diet Pills

In my role as a certified personal trainer, I've encountered numerous dietary supplements and have learned to scrutinize them rigorously.

When it comes to diet pills, it's not just about whether they work; it's about their impact on overall health and well-being. Below are the criteria I used to evaluate the best diet pills.

Ingredients

I examined the active ingredients in each diet pill, researching their efficacy and safety profiles. This involved looking into clinical trials and scientific studies to ensure that the ingredients had a proven track record of facilitating weight loss or metabolism enhancement.

Dosage

The dosage of each ingredient is critical. I checked that the diet pills contained the appropriate amounts as recommended by clinical studies, ensuring they were potent enough to be effective without posing health risks.

Price

Affordability is key for sustained use, so I compared the cost of the diet pills against their proposed benefits. I considered whether premium ingredients or a superior formulation justified a higher price point.

Safety Profile

I reviewed any potential side effects and contraindications associated with the ingredients, prioritizing products with minimal risks.

Certifications

I looked for certifications from third-party organizations (like NSF or USP) that verify the pills' quality and purity.

User Reviews

Customer testimonials were analyzed to gauge the effectiveness and user satisfaction over time.

Manufacturer Reputation

I researched the manufacturers, giving preference to those with a strong track record of quality and transparency.

Clinical Trials

Where available, I considered diet pills that had been subjected to rigorous clinical trials and peer-reviewed research.

Formulation Transparency

I valued products that provided clear, detailed information about their formula, avoiding proprietary blends with unspecified ingredient amounts.

Buyer's Guide

Close up image of hand showing different pills

Many weight-loss pills on the market today claim to help you lose weight by increasing thermogenesis, decreasing hunger, and preventing fat formation. However, deciding which of the many weight loss supplements will work best for you can be challenging.

That's why we've put together a guide on how you can find the best diet pills and how to pick among them to help you lose the most fat in the shortest amount of time without side effects or any inconvenience.

Key Ingredients

Stimulants like caffeine are a common and popular ingredient in the best weight-loss supplements that are clinically proven to help your body burn fat.

Manufacturers frequently include stimulants in their fat-burning products to bolster mood and increase motivation among consumers, as calorie restriction while using a fat burner can cause mood swings.

Our team recommends that you first assess your tolerance to caffeine before you purchase any product containing such stimulants.

People who understand their sensitivities and tolerances will be able to determine whether they can consume caffeine-rich products or whether they should consider purchasing stim-free supplements.

The Type of Weight Loss Pills

Top view of supplements on plate

Various types of weight loss pills are available to help you lose weight in one or more ways.

However, the possible benefits that they may provide vary depending on the ingredients they contain and how they work to help people lose weight.

Some weight loss pills may significantly boost metabolism because they work primarily by increasing thermogenesis, or body heat, which speeds up the breakdown of food even when you're not doing anything.

Different Types of Weight Loss Supplements

Top view of pills scattered around

Fat Burning Supplements

These weight loss supplements have thermogenic ingredients like caffeine, green tea, and pepper extracts that are known to help increase body temperature to speed up metabolism, fat burning, and nutrient absorption.

In other words, thermogenic fat burners help trigger your fat cells to free fatty acids so that your body can easily convert them into energy to fuel your day.

Appetite Suppressants

Different pills on a plate

On the contrary, these weight loss pills help people lose weight without affecting the body's internal temperature or metabolism.

Instead, they are designed to make people feel fuller for extended periods throughout the day, even if they are already on a low-calorie diet or a low-fat diet.

Typically, an appetite suppressant pill contains fiber-rich ingredients such as glucomannan and fenugreek, as well as mood enhancers such as 5-HTP that boost mood.

Carb Blockers

These weight loss supplements work by preventing carbohydrate-digesting enzymes from breaking down the carbs you eat, letting them pass through your digestive system without being absorbed by your body.

Although this type of diet pill showed little help for many people, according to some online reviews, research shows that cutting back on carbs is an integral part of losing a moderate amount of weight and keeping your body weight under control.

Stimulants

Close up image of a supplement concept

These weight loss supplements are widely used by people to boost energy, focus, and mental alertness temporarily.

Stimulant-based supplements work well for athletes and active individuals looking to increase their motivation and focus in their day-to-day routine at home or work.

When combined with a healthy diet and regular exercise, they can prompt people to make better choices for their health and ultimately, weight.

Blends

Finally, these weight loss pills are considered an all-in-one weight loss method because they help people lose weight in more than one way.

Due to the unique mix of ingredients, the supplement may help to increase metabolism, decrease hunger, improve mood, and stop carbs and fats from being absorbed by the body.

The brands on our list represent this type of weight loss supplement. Our research team believes that combining multiple ingredients into a single weight loss pill is the most effective way to burn fat. In this way, people can speed up their weight loss journey.

Dosage

tablets on top of table

The dosage of weight loss pills is crucial when it comes to choosing the best diet pills because it determines whether the weight loss supplement will be effective at accelerating weight loss in overweight people struggling with belly fat.

Also, the dosages of the ingredients in a diet pill can be a factor in determining whether or not it is safe because the human body has varying levels of tolerance for certain substances.

Full Label Transparency

When searching for dietary supplements, it is critical to always read the label.

If you see a product with a label that lists the ingredients but not their exact dosages, the manufacturer is likely using a proprietary blend of ingredients.

Some manufacturers may use “proprietary blends” to avoid including the necessary amount of active ingredients to support the product's effectiveness.

Discounts and Guarantee

If you wish to see consistent results, you may need to take supplements for several months or even years. Having said that, it is more budget-friendly for anyone to buy in bulk because some manufacturers offer considerable discounts if you purchase multiple bottles at once.

You can definitely save more money if you use a product that offers two free bottles when you order three bottles.

Also, if you're new to the product, you don't have to worry about purchasing multiple bottles. Many supplement brands offer money-back guarantees on unopened bottles if you're unhappy with them or think they don't measure up to their claims.

Some manufacturers may offer a 30-day, 60-day, or even 100-day money-back guarantee, allowing you to make a risk-free and worry-free purchase.

Related Articles:

FAQs

Are Weight Loss Pills Safe?

Yes, weight loss pills are generally considered safe because they are manufactured in strict adherence to good manufacturing practices (GMP).

Also, modern diet supplements contain all-natural ingredients in clinically-tested doses, and prescription weight loss medication are FDA approved and regulated, so taking prescription weight loss pills may also be safe.

How Can You Get The Best Results From Diet Pills?

You can get the best results from diet pills by combining them with a healthy, active lifestyle. Taking natural weight loss pills or a prescription weight loss drug may still help the body burn fat even when you're not working out.

However, you can maximize its weight loss effects by taking it in conjunction with a healthy diet and regular exercise.

How Do Weight Loss Pills Work?

Weight loss pills work by suppressing appetite, enhancing fat metabolism, and improving energy.

In effect, you can reduce your calorie intake and work out for extended periods, which can help you fast-track your weight loss journey and reach your goals faster.

How Long Does It Take for Diet Supplements to Work?

It may take two to four weeks for diet supplements to work in some people, depending on their body weight, calorie intake, and level of fitness.

For others, it may take three months of consistent use before they notice any significant weight loss changes.

Do Natural Diet Pills Help Improve Athletic Performance?

Natural diet pills can help improve athletic performance by increasing energy, strength, and endurance levels.

Also, they can enhance people’s moods, allowing them to concentrate more on their workout, perform more reps, and cope with stress better.

What Scientific Research Should Be Considered When Choosing Diet Pills?

Scientific research that should be considered when choosing diet pills is clinical trials that demonstrate their safety and effectiveness. Studies that detail long-term effects and potential side effects provide critical information for making an informed decision.

How Are Diet Pills Regulated for Consumer Safety?

Diet pills are subject to regulatory oversight to ensure they meet safety standards; however, the extent of regulation can vary by country. Consumers should seek products that have been vetted by reputable organizations and that provide transparent quality assurance details.

Can Diet Pills Be Part of a Holistic Approach to Health?

Yes, diet pills can be integrated into a holistic health strategy that includes mental well-being, proper sleep, and stress management, as these factors are all interconnected with physical health. A comprehensive approach ensures that weight loss is part of an overall lifestyle change, which can be more effective and healthier in the long run.

Our Verdict on Best Diet Pills

Our team agreed that PhenQ is our number-one product recommendation out of all the diet pills we have tested.

Since it contains only natural ingredients in the right amounts, we were able to combine it with our pre-workouts to perform better at our daily gym sessions and further increase the rate of fat loss without compromising the muscles.

PhenQ proved to be safe, affordable, and effective in terms of energy and appetite suppression, which ultimately led my clients to reach their weight loss goals noticeably faster.

Our #1 Recommendation

PhenQ (Best Overall & for Men)

PhenQ

Rated With Total Shape's Scoring System

4.9
Ingredients
4.6
Price
4.7
User Ratings
4.8
Product Effectiveness
Pros
  • Clients report improved athletic performance through increased energy levels
  • Can help strengthen bones due to its high calcium content
  • All of the ingredients have been scientifically proven to aid in weight loss
  • Risk-free due to its 60-day money-back guarantee
  • Get the BEST PRICE until the end of June
Cons
  • It is only available for purchase through the company's website
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About The Author

Lisa Lorraine Taylor, BSc, CPT
Staff Writer
Lisa Lorraine Taylor, BSc, CPT holds a BSc degree in Holistic Nutrition from Clayton College of Natural Health and is the owner of Taylor Made Fitness. Her philosophy centers on cutting through the hype and misinformation surrounding dietary supplements, focusing instead on practical, science-backed strategies for health and weight loss.
Learn more about our editorial policy
Dr. Kristy June Dayanan, BS, MD is an author with a BS degree from University of the Philippines and an MD from University of Perpetual Help System. Her ability to simplify medical science complexities and dietary supplement jargon for the average reader makes her a valued medical fact checker and reviewer.
Learn more about our editorial policy
Dr. Harshi Dhingra, MBBS, MD is a published peer-reviewed author and renowned physician from India with over a decade of experience. With her MBBS from Bharati Vidyapeeth and an MD from Rajiv Gandhi University, she actively ensures the accuracy of online dietary supplement and medical information by reviewing and fact-checking health publications.
Learn more about our editorial policy

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One thought on “7 Best Diet Pills (2024 Updated) Lose Weight Fast

  1. I’ve always struggled with losing weight, but these diet pills did help shed some stubborn fat. Glad I gave them a chance.

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Our ingredients score is based on 3 factors including: transparency, blend disclosure, and dosage accuracy. We conduct third-party lab verification of ingredients. The score is an objective measure of the lab test results compared to the product label. For more information see our ingredients score explanation here.
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