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Delivery within 2 work days
Free shipping over £50.00
60-day refund policy
More than 4.7 million customers from all over the world
Delivery within 2 work days
Free shipping over £50.00
60-day refund policy
More than 4.7 million customers from all over the world
Delivery within 2 work days
Free shipping over £50.00
60-day refund policy
More than 4.7 million customers from all over the world
Delivery within 2 work days
Free shipping over £50.00
60-day refund policy
More than 4.7 million customers from all over the world
020 8089 0131

Free consulting

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Magdalena Rybarikova - tennis player
Magdalena Rybarikova - tennis player
Star Star Star Star Star
5 / 5

A top product to help me keep my cravings in check and maitain my form.

OK!FatBurn

Food supplement with sweetener
Star Star Star Star Star
4.87 / 5
Verified 6652 Verified reviews

An effective formula that contributes to weight loss

  • Inhibits up to 77% of carbohydrate-digesting enzymes ¹*
  • Inhibits up to 63% of fat-digesting enzymes ¹*
  • Helps eliminate fat deposits and consequently contributes to weight loss ¹
  • Contributes to normal energy-yielding metabolism ⁴
  • With added power of L-Tyrosine and L-Carnitine
  • After 8 weeks, 76% users say ID-alG™ induces weight-loss**
  • 72% would continue using ID-alG™**
*  In tubo test of the inhibition properties of ID-alG™ on pancreatic lipase and bacterial amylase.
** Evaluation of ID-alG™’s weight management effect on overweight women. Monocentric, randomized, placebo controlled clinical study run in March 2010, on 56 women using 400 mg of ID-alG™ daily for 8 weeks
Neto 150 g | for 15 days
How to Use

Twice a day, mix 5 g (1 scoop) in a glass of water and drink. We recommend that you drink it before the main meals. Weighing is recommended for accurate dosing.

Warning:

The recommended daily intake or dose should not be exceeded. A foodsupplement is not a substitute for a balanced and varied diet. Ingestion during pregnancy and breastfeeding is not recommended. Keep out of reach of children!

Due to natural variations in the properties of the active ingredients, the colour, taste and smell of the product may vary slightly from batch to batch. These changes do not affect the overall quality and performance of the product.

Key Ingredients

OK!FatBurn – food supplement with sweetener.

Tapioca starch, sweetener erythritol, vitamin C (ascorbic acid), ID-alG ™ [(seaweed extract (Ascophyllum nodosum), grape extract powder (Vitis vinifera, seeds)], lemon flavor (4%), L-carnitine, L-tyrosine, stabilizer: cellulose, beetroot concentrate (maltodextrin, beetroot powder (Beta vulgaris)) (1.5%), Sweetener: steviol glycosides from stevia

Nutritional Value
Active ingredients Per 5g
Vitamin C 250 mg (312 % NRV*)
ID-alG ™ 200 mg
L-Carnitine 150 mg
L-Tyrosine 100 mg

* NRV = Nutritional Reference Value

Certifications
Why Independent Testing Is Essential At Nature’s Finest, we believe that wellness starts with trust. Here’s what our testing covers:
  • Ingredient Precision: We verify that the nutrients listed on our labels are present in the exact amounts promised.
  • Purity & Cleanliness: Each product is screened for substances such as heavy metals (including mercury, lead, and arsenic), common allergens (like soy, dairy, nuts, and gluten), and microbial threats like E. coli and salmonella.
  • Nutrient Verification: We confirm that both macronutrients and micronutrients are present and potent.
Explore our IFS Food Standard certification—the highest level of quality assurance in the industry—and see why Nature’s Finest stands above the rest. View our certification here.
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Reviews

4.87
★ ★ ★ ★ ★
Based on 6,652 reviews
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Everything you need to know:

Which ingredient helps me block fat and carb absorption?

ID-alG™ is a patented brown seaweed extract that blocks a certain number of enzymes that digest carbohydrates and fats. This reduces fats and carbs assimilation and contributes to significant weight loss. 1

What makes this weight loss formula so effective?

OK!Fatburn is an effective weight loss formula that inhibits carb and fat digestion enzymes with the power of ID-alG™. The triple-action formula contributes to normal energy-yielding metabolism⁴ with added power of L-tyrosine and L-Carnitine. Studies confirm significant weight loss correlated with fat mass. 1

How do digestive enzymes affect my weight loss efforts?

90% of lipid (fat) intake is hydrolyzed by lipases, while carbohydrate digestion is mainly carried out by the amylases. ID-alG™ inhibits amylase and lipase, which means reduction of carbs and fat assimilation from the nutrients you consume.1

What results can I expect from using OK!Fatburn?

Studies show that 76% believe ID-alG™ induces weight-loss and 72% would continue using ID-alG™. Users experience visible effects after 8 weeks of use with significant reduction in carbs assimilation. Real customers report they lost weight with OK!Fatburn and their testimonials prove its effectiveness.1

Our customers also confirm it works

star star star star star 4.9 / 5
Margaret
star star star star star 5/5

Superb product to help with weight loss, I needed a little help with my body shape before my holiday and I can assure you it really works :)

Margaret
Eve
star star star star star 5/5

OK!FatBurn truly works! I of course like to do a bit of sport, so the effects are even better :)

Eve
Maya
star star star star star 5/5

I lost signifant weight with OK!Fatburn, it's incredible and I keep getting compliments!

Maya
Monica
star star star star star 5/5

I’ve been drinking this for a bit more than two months and my coworkers say I’ve slimmed down noticeably.

Monica
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Most people struggle with cutting carbs and fats when trying to lose weight

With OK!FatBurn even if your diet isn’t »perfect« you can still get results

ID-alG™ – patented brown seaweed extract for weight management

ID-alG™ is a unique, patented extract from brown seaweed with powerful benefits for weight control.

Its effectiveness comes from natural compounds called phlorotannins, which inhibit the activity of the two main digestive enzymes:

  • Lipase – the enzyme that digests fats

  • Amylase – the enzyme that digests carbohydrates

By blocking a large portion of both enzymes, ID-alG™ helps reduce the absorption of carbs and fats – the nutrients that make up over 85% of daily calorie intake.

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Blocks more than half of carbohydrate-digesting enzymes1

Thanks to ID-alG™, a patented brown seaweed extract, the product reduces the activity of the enzyme amylase, which is responsible for breaking down carbohydrates.¹

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Blocks more than half of fat-digesting enzymes1

ID-alG™ also helps limit the action of lipase, the enzyme responsible for digesting fats.¹

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Results, demonstrated by studies

In studies, ID-alG™ was shown to support weight loss, closely correlated with fat mass, and fat reduction when used consistently over 16 weeks.¹

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Consumers’ satisfaction

Preliminary study questionnaires assess the satisfaction of users:

  • 76% believe ID-alG™ induces weight-loss**
  • 72% would continue using ID-alG™**
  • 72% would buy ID-alG™**
** Evaluation of ID-alG™’s weight management effect on overweight women. Monocentric, randomized, placebo controlled clinical study run in March 2010, on 56 women using 400 mg of ID-alG™ daily for 8 weeks

All you need is 3 minutes a day

A smarter way to support your healthy lifestyle

Step 1

Mix one scoop of OK!FatBurn with 200 ml of water.

Step 2

Stir vigorously until completely dissolved (1 min).

Step 3

Drink twice a day with food or an empty stomach.

Product option image

Why you should start taking OK!Fatburn today

Starting OK!Fatburn TODAY:

  • You contribute to weight loss ¹
  • You reduce fat and carb assimilation with ID-alG™¹
  • You support body fat mass reduction¹
  • You enjoy in a delicious, self-care ritual
  • You boost your confidence immediately

Starting OK!Fatburn later:

  • You delay significant weight loss progress
  • You postpone fat and carb assimilation reduction
  • You delay body shape improvement progress

Made from quality ingredients

ID-alG™

1. ID-alG™

ID-alG™ is a grape seed extract and an extract of the brown seaweed Ascophyllum nodosum, which is rich in long-chain polyphenols called phlorotannins. Ascophyllum nodosum reduces fat absorption and helps eliminate fat deposits, which consequently affects body weight.

L-Carnitine

2. L-Carnitine

L-carnitine is an amino acid derivative. It is a natural compound that is produced by the body itself or can be obtained from certain foods and food supplements.

L-Tyrosine

3. L-Tyrosine

L-Tyrosine is a non-essential amino acid that occurs naturally in the human body and in a variety of protein-containing foods. It is a building block used by the body in several biological processes and is a precursor to various naturally occurring compounds.

Vitamin C

4. Vitamin C

Vitamin C plays a role in the protection of cells from oxidative stress. It contributes to the functioning of the nervous system, has a role in the functioning of the immune system and contributes to the reduction of tiredness and fatigue . Vitamin C also contributes to normal collagen formation.

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Traceability of our raw materials

We select every ingredient with the utmost care and monitor it closely to ensure optimal efficacy—supported by scientifically proven effectiveness.
Our commitment to transparent traceability guarantees the integrity and excellence of every component in our products.
Our products are certified in accordance with the IFS Standard under registration number: 00063/0, and by KON-CERT under certificate number: EPR-26420/22-1.

High-quality ingredients

Carefully selected, pure formulation.

Carefully selected, pure formulation

Environmentally friendly packaging.

Less waste, more care for the planet

Third-party tested according to verified standards.

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60-Day Money-Back Guarantee

To make your purchase risk-free, we offer a 60-day money-back guarantee.
If you’re not completely satisfied with the product, simply contact us—we’ll refund your money.

OK!FatBurn

OK!FatBurn

star star star star half star 4.87 / 5 check icon Verified reviews (6652)

Enjoy your favourite foods without guilt and lose weight!

  • Inhibits up to 77% of carbohydrate digesting enzymes ¹
  • Inhibits up to 63% of fat digesting enzymes ¹
  • Helps eliminate fat deposits ¹
  • Added power of L-Tyrosine and L-Carnitine
  • Visible effect after 8 weeks of use

Frequently asked questions from our users

FAQ

How and why do they work?

With the main active ingredient ID-alG™, it has been proven to help lose body fat and therefore weight. ID-alG™ is a brown seaweed extract that inhibits the activity of two major digestive enzymes, lipase and amylase.

FAQ

Who is it for?

It is for anyone who wants to lose excess weight and fat and has difficulty following diets or reducing calorie intake.

FAQ

What ingredients does it contain?

Vitamin C (ascorbic acid), ID-alG™, natural lemon flavour, L-carnitine, L-tyrosine, natural beetroot colour (1,5 %), sweetener steviol glycosides.

FAQ

What does it taste like?

OK!FatBurn has a refreshing lemon taste.

FAQ

How long does shipping take?

We will do our best to process your order the same day and send it for delivery. On average, packages are delivered in 2 business days.

FAQ

What if I don't like it?

No worries! If the product does not meet your expectations, we offer a 60-day refund.

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Magdalena Rybarikova - tennis player
Magdalena Rybarikova - tennis player
Star Star Star Star Star
5 / 5

A top product to help me keep my cravings in check and maitain my form.

OK!FatBurn

Food supplement with sweetener
Star Star Star Star Star
4.87 / 5
Verified 6652 Verified reviews

An effective formula that contributes to weight loss

  • Inhibits up to 77% of carbohydrate-digesting enzymes ¹*
  • Inhibits up to 63% of fat-digesting enzymes ¹*
  • Helps eliminate fat deposits and consequently contributes to weight loss ¹
  • Contributes to normal energy-yielding metabolism ⁴
  • With added power of L-Tyrosine and L-Carnitine
  • After 8 weeks, 76% users say ID-alG™ induces weight-loss**
  • 72% would continue using ID-alG™**
*  In tubo test of the inhibition properties of ID-alG™ on pancreatic lipase and bacterial amylase.
** Evaluation of ID-alG™’s weight management effect on overweight women. Monocentric, randomized, placebo controlled clinical study run in March 2010, on 56 women using 400 mg of ID-alG™ daily for 8 weeks
Neto 150 g | for 15 days
How to Use

Twice a day, mix 5 g (1 scoop) in a glass of water and drink. We recommend that you drink it before the main meals. Weighing is recommended for accurate dosing.

Warning:

The recommended daily intake or dose should not be exceeded. A foodsupplement is not a substitute for a balanced and varied diet. Ingestion during pregnancy and breastfeeding is not recommended. Keep out of reach of children!

Due to natural variations in the properties of the active ingredients, the colour, taste and smell of the product may vary slightly from batch to batch. These changes do not affect the overall quality and performance of the product.

Key Ingredients

OK!FatBurn – food supplement with sweetener.

Tapioca starch, sweetener erythritol, vitamin C (ascorbic acid), ID-alG ™ [(seaweed extract (Ascophyllum nodosum), grape extract powder (Vitis vinifera, seeds)], lemon flavor (4%), L-carnitine, L-tyrosine, stabilizer: cellulose, beetroot concentrate (maltodextrin, beetroot powder (Beta vulgaris)) (1.5%), Sweetener: steviol glycosides from stevia

Nutritional Value
Active ingredients Per 5g
Vitamin C 250 mg (312 % NRV*)
ID-alG ™ 200 mg
L-Carnitine 150 mg
L-Tyrosine 100 mg

* NRV = Nutritional Reference Value

Certifications
Why Independent Testing Is Essential At Nature’s Finest, we believe that wellness starts with trust. Here’s what our testing covers:
  • Ingredient Precision: We verify that the nutrients listed on our labels are present in the exact amounts promised.
  • Purity & Cleanliness: Each product is screened for substances such as heavy metals (including mercury, lead, and arsenic), common allergens (like soy, dairy, nuts, and gluten), and microbial threats like E. coli and salmonella.
  • Nutrient Verification: We confirm that both macronutrients and micronutrients are present and potent.
Explore our IFS Food Standard certification—the highest level of quality assurance in the industry—and see why Nature’s Finest stands above the rest. View our certification here.
£33.90
-0%
Subscription
One-time purchase

Switch to subscription and save
For just you get the same. A simple way to enjoy the best prices. You can change or cancel your subscription at any time!

Add to cart ➝
Return guarantee icon 60-day money-back guarantee
Free delivery icon Free delivery over £50.00
Delivery in 2 business days
visa mastercard american_express paypal

Questions? Call us: 020 8089 0131

Customer Reviews

★ ★ ★ ★ ★
6,652
Verified reviews
4.9/5
Previous
★ ★ ★ ★ ★
Published 2 months ago by: Khadka Rai
This product is immaculate and it's really works. I'm more energetic and physically fit.
★ ★ ★ ★ ★
Published 3 months ago by: Laura Crears
These products are brilliant this coming from a sceptic. Completed 2 months and ordered more. I have lost weight, have so much more energy and anxiety has significantly reduced.
★ ★ ★ ★ ★
Published 7 months ago by: Sue Potts
Great products
★ ★ ★ ★ ★
Published 7 months ago by: Deana Stratford
All good 👍
★ ★ ★ ★ ★
Published 7 months ago by: Christine Dallas
Good
★ ★ ★ ★ ★
Published 7 months ago by: Michael Smith
Excellent communication and product
★ ★ ★ ★ ★
Published 7 months ago by: Michael Smith
Good information and reviews
★ ★ ★ ★ ★
Published 8 months ago by: Paula Murray
Quick and easy to navigate site to find what I needed. Let's hope something works.
★ ★ ★ ★ ★
Published 9 months ago by: Georgiana Mindru
I cannot wait for my order to arrive. Very good prices, easy to order. The best
★ ★ ★ ★ ★
Published 10 months ago by: suzanne Bowker
Good
★ ★ ★ ★ ★
Published 10 months ago by: Andrew Spencer
Excellent product
★ ★ ★ ★ ★
Published 10 months ago by: Danielle Beesley
Good price for x3 bundle and free delivery for 15th anniversary! Excited to see the results
★ ★ ★ ★ ★
Published 11 months ago by: Jessica Oyebade
Excellent products and prices
★ ★ ★ ★ ★
Published 11 months ago by: Margaret Kelly
Great products, easy to browse website awaiting my delivery ,
★ ★ ★ ★ ★
Published 12 months ago by: Wendy Wendy
Very helpful feedback on the promotion sites xx
★ ★ ★ ★ ★
Published 1 year ago by: Naveed Suleman
Good customer service on phone, now awaiting my order.
★ ★ ★ ★ ★
Published 1 year ago by: Nicole Edwards
Fabulous looking forward to receiving my parcel and going on my new journey
★ ★ ★ ★ ★
Published 1 year ago by: Derrick Quelch
Easy to use
★ ★ ★ ★ ★
Published 1 year ago by: Joan Collins
Very happy with your products feel much healthier, sleeping better also has helped me lose weight.
★ ★ ★ ★ ★
Published 1 year ago by: Nick Naylor
Fantastic!
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Twice a day, mix 5 g (1 scoop) in a glass of water and drink. We recommend that you drink it before the main meals. Weighing is recommended for accurate dosing.

Warning:

The recommended daily intake or dose should not be exceeded. A foodsupplement is not a substitute for a balanced and varied diet. Ingestion during pregnancy and breastfeeding is not recommended. Keep out of reach of children!

Due to natural variations in the properties of the active ingredients, the colour, taste and smell of the product may vary slightly from batch to batch. These changes do not affect the overall quality and performance of the product.

OK!FatBurn – food supplement with sweetener.

Tapioca starch, sweetener erythritol, vitamin C (ascorbic acid), ID-alG ™ [(seaweed extract (Ascophyllum nodosum), grape extract powder (Vitis vinifera, seeds)], lemon flavor (4%), L-carnitine, L-tyrosine, stabilizer: cellulose, beetroot concentrate (maltodextrin, beetroot powder (Beta vulgaris)) (1.5%), Sweetener: steviol glycosides from stevia

Active ingredients Per 5g
Vitamin C 250 mg (312 % NRV*)
ID-alG ™ 200 mg
L-Carnitine 150 mg
L-Tyrosine 100 mg

* NRV = Nutritional Reference Value

Customer Reviews

  1. Philip h. –

    Absolutely its ding it for me I am filling 100tter after 4 months great just ordered more than you

  2. Stuart S. –

  3. David H. –

    Prompt delivery and good quality supplements and prices.

  4. Justyna P. –

    Started using 2 bundles about week ago. I can see that I am eating less

  5. Carole B. –

    I love the water ok and ok fat burn I have been using for a while now and can see the difference thanks nutrisslim .

  6. Angela K. –

    Very easy to use the site. Good service and communication

  7. Yvonne M. –

  8. Alex H. –

    Love the three products together

  9. Tracey G. –

    I love using the products

  10. Simona C. –

  11. Lynn M. –

    I have used your products before a while ago and I think they are the best for me .You have more selection different products am going to try . Thanks

  12. Gordon S. –

    I started using the product 5 weeks ago and I am very happy with the progress. Also the service was good. I will be continuing with it for the forseeable future.

  13. Suphawadi W. –

  14. Dawn S. –

    Great stuff night weight loss 3rd time buying reliable delivery and customer service

  15. Catrina H. –

  16. Svitlana P. –

    I love this products. No bloating anymore

  17. D H. –

    Fantastic products that really work

  18. Dawn S. –

    Great compant

  19. lieselotte M. –

    Was simple to use

  20. Briggitte B. –

    Sleep like a baby using night fat burn!

Frequently asked questions from our users

When is the best time to take it?

I recommend that the product is taken twice daily (5g each) before lunch and dinner to aid fat digestion.

Can pregnant women and nursing mothers consume it?

Pregnant and lactating women are discouraged from use.

Is it suitable for vegans?

Yes, the product is suitable for vegans and vegetarians.

Can I take it alongside medication?

Dietary supplements are foods that are intended to supplement your normal diet, if you are taking any medication, consult your personal doctor before taking a dietary supplement.

What can I do if I don't like the taste? And can I mix it with boiling water

If you don’t like the taste, you can mix it into juice, smoothies or dissolve it in more water. We do not recommend consuming this product in hot water as this may destroy the effect of the active ingredients and vitamins.

Can children consume it? From what age can I consume the product?

The product may be consumed by persons over 15 years of age.

Diabetics and other health conditions?

This product contains maltodextrin, which increases blood sugar levels and is therefore not recommended for diabetics and in case of associated conditions, consultation of a personal physician is recommended.

Are there possible side effects?

The product is usually well tolerated and many users report no side effects. However, it is important to understand that each person reacts differently to dietary supplements. Consult a nutritionist or doctor before use, especially if you have any health problems or are taking medication.

Advice from our experts in addition to eating the product?

1. regular physical activity 2. balanced diet 3. quality sleep 4. adequate hydration 5. limit alcohol intake 6. reduced intake of sugary, salty and processed foods 7. food diary

Is the product suitable for both women and men?

Yes, the product is suitable for women and men.

Is the product suitable for people with high blood pressure and thyroid problems?

Persons with high blood pressure and thyroid problems are advised to consult their physician before using this product as it may affect blood pressure and thyroid function.

Product not well mixed, lumps, contents floating on water?

Clumps are a perfectly normal occurrence in a powdered product that absorbs moisture. Floating contents are insoluble plants which do not affect the quality of the product. If the contents do not dissolve in water and/or bother you, you can remove them and they can also be eaten.

What is ID-alG™?

ID-alG™ is an extract of the brown seaweed Ascophyllum nodosum, which is rich in long-chain polyphenols called phlorotannins, which inhibit the activity of two major digestive enzymes, lipase and amylase.

Why choose Nature’s Finest?

15

Years of tradition

400+

Unique products”

50+

Patented active ingredients

3mil+

Satisfied customers

Nature

We believe in the perfection of nature. Our commitment extends to the responsible sourcing of raw materials, including sustainability, ethics, and fair business practices. To reduce our carbon footprint, we use environmentally friendly packaging.

The effectiveness of our products is confirmed by verifiable and reproducible studies and research. All of our products are tested in independent laboratories, as our goal is to offer our customers only the highest-quality and most effective products for their money.

 
 

Nature offers effective solutions to many of the challenges we face. Our experienced development team harnesses and combines these exceptional substances in our products so the body can make optimal use of them. The active ingredients in our products are included in proven effective amounts—not just in small, negligible quantities.

We test our products through various user studies and trials to ensure their safety and effectiveness. We always listen closely to our customers’ feedback and take their opinions, reviews, and suggestions into account to ensure our products are truly tailored to their needs.

Meet our product development experts

We are proud that our team consists exclusively of top experts in nutrition and natural formulations, ensuring the development and outstanding quality of our products. With great dedication, they conduct studies and research and work closely with external laboratories, testing institutes, and other specialists to guarantee the highest quality and safety of our products.

Thanks to their extensive experience and industry expertise, our experts are committed to providing Nutrisslim customers with the most innovative products and to maintaining our status as one of the leading companies in the field of nutrition and dietary supplements.

Meta Bizjak

M.Sc. in Nutritional Engineering

Pia Fistrovič

Food and Nutrition Engineer

#WeAreNature

»Committed to bringing the most natural products to your home«

For over 15 years, Nature’s Finest has been dedicated to providing natural solutions for everyone who wants to overcome lifestyle-related challenges and discomforts. We use only 100% natural ingredients, produced traditionally, without additives or unnecessary processing. Whenever possible, we choose organically grown ingredients certified under SI-EKO-001.

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