Updated: 01/14/2018

This review is what happened after I obsessed for weeks over Optislim. We decided to dig deep, examining the ingredients, side effects, scientific research and level of customer care. Plus we sorted through all kinds of user comments and dieter reviews from the internet. Finally, we then summed up all the data and responses we found to give you the info you need.

OptiSlim Readers: Click here to find out why we're giving away samples of our product, Burn HD.

What is Optislim?

First off, Optislim is an Australian weight-loss program that was originally developed to help morbidly obese patients with weight reduction. [1] This VLCD (very low calorie diet) incorporates total meal replacement and the meals are claimed to taste good and be affordable. [2] A LCD (low calorie diet) program is also available, and it involves partial meal replacement. The food products include cookies, bars, soups, shakes and main course dishes like beef stroganoff and chili con carne. These products can all be purchased via the main website. There are now four different types of programs; weight-loss, detoxing, toning and weight management.

From what we gathered, Optislim has been around since 1996. There are some success stories posted on the company website and a decent variety of low-calorie foods and supplements are available, but read on…

Taste of Optislim – “A Concern?”

The first thing we looked into with OptiSlim was the taste. According to our Research Editor, “We found all sorts of negative customer reviews pertaining to the food and supplements. This is a major drawback because if you can’t stomach the diet foods/supplements involved, you probably can’t commit to the diet.” [3]

One customer said, “A waste of money and food is [bad].” [4]

“These shakes taste really awful. No Thanks!,” said another dieter.

Side Effects – “A Drawback?”

Some people have experienced OptiSlim side effects from the supplements. One customer commented, “My husband has been using Optislim and has been…dizzy.”

Another user stated, “When I stopped drinking it my headaches had gone. I went back on the shakes a month later and my headaches returned!!!”

The intensive research we’ve conducted has shown if there is a specific aspect of a diet program or supplement that is quite burdensome (too many side effects, unpleasant taste, a painful exercise) the odds of real fat loss success are not good. In other words, if Optislim does in fact lead to adverse reactions in a lot of people, this could be a real dilemma. [4]

The Science – “Any Evidence?”

We were unable to find any solid science provided on the official Optislim website. While we know that seriously reducing your daily caloric intake will lead to weight reduction, you can also accomplish this without the Optislim program. At DietSpotlight, we need to see published clinical research that supports the weight-loss product or program. [5]

What Users Are Saying

"”Great way to try all the flavors – I liked them all!”"

"”This shake mixes up very nicely with ice-cold water. It tastes pleasant and the texture and smell are nice too. As far as diet shakes go it is one of the better ones. I have ordered some more of these.”"

"”I am new to these shakes. Some of the flavors are good and others are not so great.”"

The Bottom Line – Does Optislim Work?

So, should you invest in Optislim for weight-loss? [6] Well, we like Optislim’s longevity as a diet program and some positive comments we saw about it online. However, we have some reservations about it because it’s not backed by science. Moreover, we’re concerned about the unpleasant taste of the supplements and the side effects they can cause.

If you’d like to drop more weight, then we advise you to go with a diet program or weight-loss product that is backed by solid science, does not cause unpleasant side effects and is easy to use.

Among the best products we’ve seen this year is our product called Dietspotlight Burn. Its formula is a blend of four ingredients, all clinically-tested with results often found in publications such as The American Journal of Clinical Nutrition and the Journal of Medicine.

Furthermore, we’re so confident that you’ll love our supplement that we’re offering a Special Trial Offer, which is a positive sign.

Learn More About Burn HD »
OptiSlim Customers Also Bought:
Effective Ingredients
Sample Offer
Explanation of Chart
Garcinia Cambogia
Caralluma Fimbriata
Raspberry Ketones


What are the ingredients in Optislim?

Optislim has a variety of weight loss diet shakes. Some of the flavors are chocolate, caramel crunch, pumpkin soup, strawberry, lemon cheesecake, French vanilla, and Honeycomb.

What are the side effects of Optislim?

Some consumers have complained of slight headaches when drinking the shakes, but the majority have not complained of any.

How do I know if OptiSlim is right for me?

Choosing the right product is the #1 question asked by DietSpotlight readers. We recommend trying any product before buying it and know that finding a product with a sample offer is near impossible - so we created our own product, Burn HD, with scientifically backed ingredients.

Click here to get your sample of our powerful fat burner today.

Does Optislim work?

Yes, reviews are that it does help with weight loss and the results are seen between 2 to 4 weeks. Consumers also say that the shakes are very tasty and mix well with water if the taste is too strong.

What is the price of Optislim?

One box of shakes will cost you around $40.00.

OptiSlim Ingredients

Below is Platinum (VLCD) chocolate formula.

OptiSlim Ingredients and Supplement Facts

Serving Size: NL
Serving Per Container: 21
Amount per Serving% DV
Green Coffee Extract134 g*
Glucomannan1 g*
Ginseng23.1 g*
Calcium233 g*
Phosphorous250 g*
Magnesium117 g*
Molybdenum20 g*
Selenium17 g*
Chromium16 g*
Iodine47 g*
Copper0.5 g*
Zinc3.2 g*
Manganese0.33 g*
Iron5.33 g*
Vitamin A234 g*
Vitamin C15 g*
Niacin (Vit B3)6 g*
Folic Acid67 g*
Biotin5 g*
Pantothenic Acid (Vit B5)1 g*
Vitamin B120.5 g*
Vitamin B60.7 g*
Riboflavin (Vit B2)0.53 g*
Thiamine0.4 g*
Vitamin E3.4 g*
Vitamin D32.5 g*
Potassium542 g*
Dietary Fibre1.2 g*
Sodium238 g*
Protein10.3 g*

Other Ingredients: None

  • References
  • 1. (). . .


Previous OptiSlim Review (Updated January 1, 1970):

What is OptiSlim?

OptiSlim VLCD is a very low calorie diet system that replaces meals under the recommendations of a health professional. Within the diet industry, VLCD's are viewed as "extreme" weight loss options, and are usually carried out under a doctor's supervision. The shakes provided will allow a dieter to maintain his or her daily nutritional requirements and lose weight at the same time. OptiSlim Soups contain 25 vitamins and minerals. However, when under this diet arrangement, it is important to maintain fluid intake during the day. The recommended amount is about 2 liters per day.

Ingredients Used in OptiSlim

The ingredients will vary based upon the product used.

Product Features

OptiSlim is a very low calorie diet containing 3350kJ, which amounts to 800 calories or less per day. There are about four products from OptiSlim. These are VLCD Shakes, VLCD Soups, MAX Tablets and OptiSlim Shakers. OptiSlim Soups have seven sachets per pack that come in flavors of tomato, pumpkin and chicken. The OptiSlim Shakes come in milkshake taste and in three flavors Vanilla, chocolate and Espresso Coffee. They contain minerals, vitamins, and trace elements that come in balanced levels. OptiSlim tablets also come with the right and balanced amounts of vitamins and minerals. However, it is still advisable for someone under the OptiSlim program to ensure that he or she has a daily consumption of fibers, low starch vegetables like broccoli, mushrooms, lettuce, spinach, green beans or cucumbers.

People with diabetes, liver disease, gall bladder disease, kidney problems or cardiovascular diseases should first consult a doctor before starting on any VLCD regimen. This is because the program will usually affect the body's metabolism processes and may cause an individual to experience significant physical changes like weight loss. This may affect existing medical conditions. Thus, regular checkups and monitoring by a physician is required to manage these medical complications.

The Advantages of OptiSlim

  • OptiSlim has been shown to reduce the chances of one being overweight and obese.
  • Obesity has numerous complications that include high blood pressure, cardiovascular problems and other forms of cancer. Thus, one reduces the chances of getting these diseases.

The Disadvantages of OptiSlim

  • The use of OptiSlim causes a person to experience some unpleasant reactions including headaches, dizziness, constipation, bad breath, nausea and diarrhea.
  • Following the VLCD program will also cause a person to have an increased amount of uric acid in the body which may lead to the development of acute gout. Acute gout is very irritating and will usually require a doctor's assessment to reduce the discomfort.
  • A VLCD should only be followed under the strict care of a physician.


With only 800 calories or less in a day intake, OptiSlim VLCD programs are clearly one of the most effective weight loss programs on the market when followed under the care of a doctor. The backing of clinical trials on these products is evidence of their safety and effectiveness, but this safety is not something that should be determined by the individual. In order to lose weight effectively without a dangerously low amount of calories, we recommend a fat burner or other weight loss supplement and a healthy diet and exercise.

Summer Banks Dietspotlight Author
About the Author:

Summer Banks, Director of Content at Dietspotlight, has researched over 5000 weight-loss programs, pills, shakes and diet plans. Previously, she managed 15 supplement brands, worked with doctors specializing in weight loss and completed coursework in nutrition at Stanford University. full bio.

52 OptiSlim Reviews

  • Contains any Caffeine
    Rachael Nolan

    Do optislim products contain any caffeine? I am very sensitive to caffeine and suffer severe withdrawal symptoms that require medical supervision if i ingest a lot of caffeine and then stop. I also suffer heart palpitations if I take fat burner tablets that utilise caffeine.

    • Your Name

      no they don’t

  • Does its using is good, I'm a diabetic?
    Maureen Prien (Verified User)

    Just started and it tastes great but im a diabetic and wondering what the GI of this product is as my sugars seem a little higher.

    • donette

      i tried the opti slim shakes my blood levels were very high and i felt very unwell and my eyes went funny i am on insulin at night

      • Pam

        I’m a type 2 diabetic and take Diabex. I’m due to have surgery later this year and need to lose weight, I’m using Optislim on the advice of my dietician and my blood levels have been really good, I feel great and have no side effects whatsoever.

    • Your Name

      Are you feeling stressed by the dit?

  • Your Name

    Tell us your thoughhi I have just started optislim shakes I have one to shakes a day and very small meal at night is this correct way to lose wight with this product?? Thanks for any advice
    I can not do excerise due to have a disability with my leg

    • Devon (Editor)

      The Optislim site says you can have up to 3 shakes a day when replacing your meals. Be sure to also at least 2 liters of water per day. If looking to burn fat, suppress your appetite and boost your energy, might want to consider Dietspotlight Burn.

  • Your Namejulie

    when do I take tabs before or after food or a replacement to food optislim Garcinia cambogia

  •  Duration to take Effect
    Penny Cottee (Verified User)

    I have just started Optisilm approximately how long will it take for Ketosis to start??

    • Your Name

      2 days

  • Dosage Procedure to take
    priya (Verified User)

    One more question
    At what time i eat this tablet means after meal or before meal

  • Can take shakes and tablet together?

    Hi is it possible to use the shakes and tablets together?

    • Maribel (Editor)

      Hi Hellen, after some research it seems to be okay. Make sure you consult with your doctor, however. Also, if looking for a clinically proven ingredient, with positive user feedback, check out Dietspotlight Burn for rapid weight-loss.

  • Approved Product Or Not
    kevin forrest

    is optislim approved by australian nutritionist or diet association

  •  skim milk
    sakshi (Verified User)

    just want to know if optislim shakes can be taken with cold skim milk instead of water because my friend is using another brand shake with skim milk and she fells really full than i do with water

  • Your Name

    I’m on optifast one shake per day and losing half kilo per week. Great stuff very pleased. Will be starting on two shakes a day.

  • Suzie

    Hi, I’m 47 years old and have been told I need to lose 40kg. I gave up drinking and smoking 2 weeks ago and I’m proud of that but I’ve struggled with my weight my whole life. After getting a kick in the pants from my doctor, I really want to be healthy and happy. I’m giving Optislim a go. I think it’s great so far (4 days in) because in don’t have to weigh anything and obsess over food. I can have my shake and get on with something non food related. I have a big bowl of steamed vegies in the evening as well. I have lost 1.2kg in 4 days. Another benefit is that for years I’ve suffered with gastric reflux and heartburn and now, I’m glad to say it’s gone!

  • Optislim Smoothie Shake
    Cathy Swan (Verified User)

    My husband and I make a fruit and spinach smoothie with optislim shakes and they are delicious! In the mornings we have the green veg, celery, Apple, etc with vanilla shake and in the evening, mixed berries lots of ice with strawberry shakes! We are losing weight steadily!! 😁

  • OptiSlim
    Your Name

    Where to purchase OptiSlim. In India mumbai

    • Stephen (Editor)

      It may not be available in retail stores there.

  • Ratio of Weight Loss

    I m from india and from today itself i started optislim tablets
    My weight is inbetween 75 to 80kg and my height is 153 so pls let me know to refer my height how many kg i loss
    Also in a week what is ratio to loss the weight to using this tablet

  • Caffeine in Shakes
    Rachael Nolan (Verified User)

    Hi i found out the shakes contain caffeine. Can you tell me how many mg of caffeine per serve? I might still be able to take them if its not too high..

  • I have kidney failure
    halina flak

    Just recievef my order and was told I was not able to take this products ad I have kidney failure and was told by drs and chemist that im unable to have the product could anyone please get back to me so I can send this back

  • Is it safe for a 16 years girl?

    My 16 year old daughter wants to try optislim, is it safe for her, she is not fat just wants to lost a little off her stomach

    • Gail

      she just needs some tummy exercise not vlcd !

  •  Finding is easy, slowly losing 1kg per week.
    Maura (Verified User)

    I’ve been on Optislim for almost four weeks, finding is easy, slowly losing 1kg per week. Headache the first two days but increased water intake, feeling great and never hungry like when on other diets. I have shake for breakfast and lunch, small meal for dinner. I can’t exercise. Still enjoying coffee & tea on low fat milk, no sugar or sweetener.

    • Cathy

      I am just starting the Optislim VLCD, I am struggling to understand exactly the regimen to follow, can you give me a run down so that I know I am doing it correctly. Is it 3 meals a day being replaced with bars/shakes or are there snack times involved, I am very confused and dont find the website at all helpful

      • Carlina

        I’m having three product’s a day.
        Shake for breakfast, sometimes blended with frozen berries.
        Salad and chicken, fish or meat for one or two meals a day. But only non starchy veg. No pumpkin potatoes parsnip corn etc. Salad once a day and sometimes cooked veg once per day. A diet bar for after noon snack.
        A diet dessert like optifast lemon or chocolate pudding.
        Optislim and optifast are the same really so interchangeable.
        Small serves of protein food and mininum 2 cups veg per day.
        As much diet drink as I like.

    • Your Name

      I had a headache too but I also cold turkey went off caffeine cos I can’t do coffee without sugar. Your headache might not be due to actual ingredients. Might be cos of something your not having any more.

  •  Hated the product.
    jacquie (Verified User)

    Husband using Optislim been vomiting and dizzy

    • Gail

      Your headaches are caused by going into ketosis you just need to drink more water and should pass after a few days!

    • bree

      Iv just started talking it doctors orders as im struggling to lose my baby weight..iv been vomiting and really bad heart burn and feeling sick and no energy I hope it passes

      • Your Name

        Tell your doctor

  • Does it affect my liver?

    I’m about to have a gastric sleeve op in less than 2 weeks, most other patients are on Optifast but I am on Optislim, does Optislim reduce the size of the liver the same way Optifast does??

  • Where to buy in UAE

    Whear i will buy in uae

    • Your Name

      Depends where you live
      Local pharmacy perhaps

  • how much wight should i lose a week
    Anonymous (Verified User)

    hi i have just started optislim lcd today how much wight should i lose a week (average)

  • How long that you can take it

    Hi How long that you can take it? i have been take optislim for 2 years on and off.
    Thank you

  • Where can I get the Optislim recepie Book in Queensland
    Elaine stevens

    Where can I get the Optislim recepie Book in Queensland I can’t seem to be able to get it anywhere.

  • can I purchase optislim in Dubai?

    can I purchase optislim in Dubai?

  • Where can i purchase optislim tablets.
    patricia armstrong

    where can i purchase optislim max tablets.thank you

    • Optislim Customer Care

      Hi Patricia.
      Optislim MAX tablets are available at My Chemist and Chemist Warehouse stores throughout Australia as well as Discount Drug Stores, Pharmacy Select Stores, Blooms The Chemist.
      Kind Regards,
      Optislim Customer Care

      • sonia

        can i have this with soy or rice milk instead of water i am not fat just wanna get rid of a kilo or 2??? I work out and run twice a day so will maybe just replace my evening meal and the odd lunch. always have a healthy breaky!!

        • Your Name

          You don’t need it then. Just have your skim milk and a few nuts instead. Cut the cars.

  • Are optifast and optislim of same company

    Are optifast and optislim one and the same company?

    • Optislim Customer Care

      Hi Millie.
      Optislim is a wholly owned Australian company and it’s products are manufactured in Australia. Optifast is owned by Nestle and their products are made in Germany.
      Kind Regards,
      Optislim Customer Care

    • Koy

      No. Optislim is an Australian company, and Optifast is made from an American company, Nestle

  • Does theOptiSlim shake contain any fibre? and if not, why not?

    Does theOptiSlim shake contain any fibre? and if not, why not?

    • Christina

      Yes, you’ll find that it will contain inulin, a fibre that promotes bowl movements. Some people will experience runny stools as a result but I think they’d be in the minority, shakes tend to bind you up so the inulin counteracts that a bit.

      • Stacey

        Too many negatives. Why put inulin in the first place. That then needs to be countered by binders? That in itse

      • Stacey

        Why put inulin that then needs to be bound up. Too many negatives with the product. I was going to try it until I read the reviews. Better to stick to fresh food that you prepare yourself