Bioslim makes the lofty claim that they offer the “world’s most powerful all-natural weight loss system”. This is not the first time that we’ve heard this kind of claim and, since there is no existing standard for “powerful” or “all-natural” in this context, this seems to be a tough claim to defend. It seems more likely, however, that Bio-Slim are capitalising on the same hyperbole seen all over the supplement industry due to a lack of proper regulation. In this article, we’re going to examine whether this statement has much truth and whether Bioslim is worth your time.
As with many other dietary supplements, Bioslim’s active ingredient is green tea extract. The suggestion is that this ingredient provides a high quantity of particular polyphenols and caffeine that act, synergistically, to increase the body’s production of noradrenaline. Through the production of higher levels of noradrenaline, we increase the calorie usage of ‘brown’ fat tissues  as well as an increase in lipolysis (the use of bodyfat to fuel bodily functions) and reduction of digestive activity . This appears to be a well-documented and scientifically-recognised function of the extract, providing a boost to the metabolism through thermogenesis and reducing the effectiveness of digestive mechanisms.
Bioslim also contains a variety of vitamins and minerals that many people are deficient in. Whilst there is some doubt about whether or not certain micronutrients are better eaten or supplemented, addressing deficiencies in vitamins and minerals can improve health and metabolic function. Bioslim also includes a food guide that is meant to work synergistically with the items contained in the Bioslim products themselves. The difficulty here is in establishing the efficacy of these products independently of the dietary changes. Changing diet alone will improve health and weight loss (always a good thing), but it makes it far more difficult to say that the supplements have been the active cause of weight loss, rather than the diet itself.
5/10 – some scientific support, seems unnecessary
When considering the safety and effectiveness of any dietary supplement, we have to weigh the pros and cons of consuming it as compared to the control of not doing so. In this situation, we have to imagine that the value of a dietary supplement consists in its ability to either improve the effectiveness of proper diet and exercise or, somehow, replace it. Thus, when we are considering the value of Bioslim, we have to consider it as both a compliment and replacement for traditional weight management (proper diet and exercise).
Whilst there are some initially promising aspects of Bioslim, there are also a number of aspects which seem to be unnecessary or over-complicate the process. Whilst the clinical evidence in support of Bioslim suggest that noradrenaline/norepinephrine can improve brown adipose tissue metabolism to 200-300% of basal rate , this does not describe the relative contribution of brown fat metabolism to the metabolism of the whole human. Additionally, attempting to increase dietary effectiveness by consistently supressing the functions of the digestive system is far from safe, not to mention the association of excessive noradrenaline/norepinephrine with a variety of negative health conditions. The weight loss caused by green tea extract, via noradrenaline/norepinephrine, is the result of prolonged excitation of the Sympathetic nervous system and problems such as high blood pressure  and thus myocardial ischemia (a common precursor to heart disease/failure).
The question here is whether this is a sufficient trade-off for the benefits that may be acquired from the use of Bioslim products. The contribution of these supplements to weight loss – a small increase in overall metabolic rate and an increase in lipolysis – cannot be used to replace proper calorie balance but only as a compliment. Increase in metabolic rate is most effectively and safely improved by gaining extra metabolically-active tissue (primarily skeletal muscle). Lipolysis primarily occurs during caloric deficit and small improvements in metabolism are not likely to consistently negate systematic over-eating and under-exercising. When we are already in a situation where we are on a balanced diet with proper calorie restriction, the perceptible benefits of Bioslim are relatively smaller and the costs are relatively greater. Using supplements to increase noradrenaline production, eliciting heightened Sympathetic nervous system activity for the sake of small dietary improvements, at the expense of proper digestive function, seems excessive. Whilst it is not our place to tell you what you should do with your health, this seems to be a raw trade.
3/10 – irresponsible and harms dietary awareness
Whilst there is a serious trade-off associated with the supplements that Bioslim produces (which is dependent, perhaps, on what individuals value more between digestive function and speedy weight-loss), their approach to the food plan does not have the same value.
Whilst there is a focus placed on eating well, from high-quality fat sources and a variety of traditionally-healthy foods, the Bio-slim food plan “specifically avoids the counting of calories, fat or carbs, because those present psychological barriers to long-term success”. It should be noted that there are no appropriate citations to this point on the Bioslim website because it is fantasy. Whilst strict calorie and macronutrient counting can be time consuming, confusing or boring, advising all individuals to ignore the importance of energy balance and macronutrients is fundamentally wrong and intellectually dishonest. Individuals who fail diets do not do so because they paid too much attention to their calories and macronutrients, but rather because they either didn’t pay enough attention to them  or have poor goal-setting/habituation skills.
When we remove the focus of a diet from the essentials of calories and macronutrients, it is incredibly easy to overeat. The vast majority of the population have no idea what the calorie or macronutrient content of their food is – developing a proper awareness of these, through at least some calorie and macronutrient counting, will benefit everyone in the long-term. Discouraging this behaviour demonstrates that there is some sense in which Bioslim does not have the best interests of customers at heart: this may seem like a bleeding-heart criticism but diet supplement companies should aim to improve the health and fitness of customers. Actively promoting ignorance of how the body works strikes us as contradictory to this responsibility.
1/10 – absolutely awful, scientifically dishonest
As we progress through this review, things have gone from mediocre to worse for Bioslim. The value of their dietary supplement is dubious, their diet plan seems to miss the mark by a bit and the exercise plan seems to deliberately dishonest and un-scientific. The main tenet of the Bioslim activity plan is that “lifestyle activities such as walking, gardening, playing, are just as effective in increasing metabolic rate and achieving fitness as heavy exercise regimens”. This is contrary to the entire wealth of literature that has been produced in sports science and defies basic science about “work done” and the associated energy demands. The research cited in support of this statement is unbelievably weak. Many of these studies were performed on previously-sedentary individuals  or report findings that directly dispute Bioslim’s statement .
Firstly, sedentary individuals will positively respond to any exercise stimulus with huge improvements, as US Olympic weightlifting coach Greg Everett once remarked: “If an individual is untrained enough, I can improve his deadlift with nothing more than vigorous nose-picking”. Additionally, treadmill running does not constitute “heavy exercise” and expecting sedentary individuals to self-report exercise intensity ignores the fact that untrained individuals have poor proprioception and an equally-poor ability to recruit maximal efforts (because maximal recruitment of muscular force or cardiovascular endurance is trained). In , Andersen et al report that, whilst the Lifestyle activity group lost 0.4kg more weight, 0.9kg of this weight loss was likely muscle or other functional tissues. Clearly, Bioslim’s approach to exercise is informed by poor science and a lack of experience in the field of sport science, physical culture or actual physical competence.
Perhaps you’ve read everything so far and are thinking “there’s some debate about the effects, but I might try it for myself and ignore the abysmal exercise guidelines”. That’s everyone’s prerogative to take responsibility for their own health, but is this something that your wallet will approve of? Well, that depends how much you already pay for your multivitamins. The Bioslim “complete kit”, providing a 6-week supply for $89.85, including a vitamin and mineral supplement, “slimtone formula” (a green tea extract pill), a variety of reference guides including the awful “activity” planner. As mentioned above, there are ups and downs to this product, but from a value standpoint we’d struggle to recommend it: vitamins and minerals can be purchased inexpensively in a variety of forms and the “slimtone” formula’s ingredients can also be bought individually for much lower prices.
Whilst there are far more expensive and ineffective supplements on the market, there is little to recommend Bioslim, from our perspective. When supplements add minimal value to a well-balanced diet, they are relying on individuals not actually improving their approach to food and diet. If the main goal is weight loss, the best approach is to improve the calorie, macronutrient and micronutrient balance of your existing diet. These are nutritional constants and only have positive effects on the body: supplements such as those peddled by Bioslim provide a mixture of small positive and negatives and provide minimal improvement to a solid diet and exercise regimen.
Overall, we have a very neutral impression of the Bioslim weight loss supplements themselves: there are positive and negative effects associated with them. For those who have a great deal of excess money and adipose tissue, they may well be worth a try (under caution and a physician’s guidance) but for many others they offer very little, qualified benefits. The willingness of the company to misrepresent scientific findings, or cherry-pick articles that ignore consensus in a whole field of science, is worrying. For anyone, the Bioslim activity guide is not only ineffective but actively spreads misinformation. Our belief is that the supplements are of questionable value and the activity guide is unquestionably worthless.
Related to Bioslim: Phentaslim Review (New 2020) - Why we rate it as #1
 Bahler, Molenaars, Verberne , Holleman (2015): ‘Role of the autonomic nervous system in activation of human brown adipose tissue: A review of the literature’. Diabetes & Metabolism, 41, pp.437–445.
 Thorp and Schlaich (2015): ‘Relevance of Sympathetic Nervous System Activation in Obesity and Metabolic Syndrome’. Journal of diabetes research, 341583 [URL = https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4430650/]
 Malpas, SC (2010): ‘Sympathetic nervous system overactivity and its role in the development of cardiovascular disease’. Physiological review, 90(2), pp. 513–57.
 Lara, Scott and Lean (2004): ‘Intentional mis-reporting of food consumption and its relationship with body mass index and psychological scores in women’. Journal of human nutrition and dietetics, 17(3), pp.209-218
 Dunn, Marcus and Kampert (1999): ‘Comparison of lifestyle and structured interventions to increase physical activity and cardiorespiratory fitness: a randomized trial’. JAMA, 281(4), pp.327-334
 Andersen, Wadden, Bartlett, Zemel, Verde, Franckowiak (1999): ‘Effects of lifestyle vs structured aerobic exercise in obese women: a randomized trial’. JAMA, 281(4), pp.335-340
Steven has researched over 500 weight-loss programs, pills, shakes and diet plans. He has also worked with nutritionists specializing in weight loss while coaching people on how to transform their physiques and live healthy lives. You can contact him via the "About Us" page.
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