• Slenderize™
  • Slenderize™
  • Slenderize™


  • $22.00
  • - 0%
Clinically Proven Formula!  

Slenderize™️ is our all-natural, clinically proven formula to assist weight loss and regulate blood sugar. Our bespoke formula comes in easy to swallow capsule form and has helped thousands of people manage their weight effectively. Slenderize® does not contain any laxatives or stimulants so is safe to take at any time of the day or night.

Twenty First Century Herbs Vegan Friendly Food Supplements
"Scientific Research of Slenderize® has led to its increasing popularity as a dietary supplement. This is because, when taken  as part of a low-calorie diet, scientific tests have determined that Slenderize® aids weight loss. Our formula increases the feeling of fullness, therefore encouraging the user to consume fewer calories."

Like other soluble fibres, it’s believed to promote weight loss in several ways :

    1. It’s very low in calories.
    2. It takes up space in your stomach and promotes a feeling of fullness (satiety), reducing food intake at a subsequent meal
    3. It delays stomach emptying, contributing to increased satiety 
    4. Like other soluble fibres, it reduces the absorption of protein and fat
    5. It also feeds the friendly bacteria in your intestine, which turn it into short-chain fatty acids like butyrate, shown to protect against fat gain in some animal studies

Does It Really Work?
Several randomised yet controlled trials have studied the effects of Slenderize® on weight loss. These types of studies are the gold standard of scientific research in humans.

In the largest study, 176 healthy but overweight people on a calorie-restricted diet were randomly assigned Slenderize® or a placebo. Weight loss was significantly greater among those who supplemented with Slenderize®.

Several other studies agree with these results. Slenderize® caused modest weight loss in overweight and obese individuals when regularly ingested before a meal.

It’s particularly effective when combined with a weight-reducing diet.

According to a systematic review of 14 studies, Slenderize® can lower:

  • Total cholesterol by 19 mg/dL (0.5 mmol/L).
  • “Bad” LDL cholesterol by 16 mg/dL (0.4 mmol/L).
  • Triglycerides by 11 mg/dL (0.12 mmol/L).
  • Fasting blood sugar by 7.4 mg/dL (0.4 mmol/L).

It primarily reduces blood cholesterol by decreasing the absorption of cholesterol in your gut.

As a water-soluble fibre, Slenderize® has also been successfully used to treat constipation.


How do I take it?

2 Capsules before meals with water. Slenderize® does not have any effect on weight loss unless it is taken before a meal. Timing recommendations range from 15 minutes to 1 hour before a meal.  It should be washed down with 1–2 glasses of water or another liquid.

Does Slenderize® contain any stimulants such as caffeine?

No, Slenderize® contains no stimulants, artificial or natural! 

Is Slenderize® safe to take?

Slenderize® is well tolerated and generally considered safe.

Is Slenderize a laxative?

No! Slenderize® is NOT a laxative, it gently regulates the bowels.

Will I experience any side effects whilst taking Slenderize?

Slenderize® is well tolerated and generally considered safe. Some people may experience mild side effects, such as bloating, flatulence, soft stools or diarrhoea, but these negative effects are uncommon. 

Can I take it alongside any medication?

There are very few contraindications with any medication. Slenderize® can reduce the absorption of oral medications like sulfonylurea, a diabetes drug. This can be avoided by taking the medication at least four hours after or one hour before ingesting Slenderize®.

Are the supplements vegetarian friendly?

Yes, all our products are vegan and vegetarian friendly. Our ingredients are 100% natural and have been handpicked by leading herbalists, based on 85 years of expertise.

Are the capsules Gluten Free?

Yes, Slenderize® is 100% Gluten Free.

Is Slenderize® Dairy Free?

It most certainly is, we pride ourselves on Slenderize® being dairy-free!

I'm pregnant/lactating. Can I still take Slenderize®?

We would encourage you to consult with a medical practitioner before taking Slenderize®.

What if I have questions whilst taking it?

We pride ourselves on working with our customers every step of the way. We don’t just leave you once you have bought the product. We are always available via phone, email or our online chat if you have any questions.

Do I need to follow a specific diet whilst on Slenderize®?

We don’t advocate a strict diet whilst on Slenderize® but we strongly encourage a healthy and balanced diet, rich in fruits and vegetables and calorie controlled with exercise. 


Ingredients in Weight Descending Order mg/cap Function

Glucomannan Konjac 500.00 Active

Chromium Picolinate 2.00 Active 670.00

We offer a standard delivery service for just £1.95. We offer a premium delivery service for £3.95. It's FREE delivery on all orders of £20 or more! 

Testimonials & Reviews
* The views expressed above are the opinion of Twenty First Century Herbs customers. Twenty First Century Herbs does not endorse these views, nor should they be regarded as health claims or medical advice.