The full-text screening stage of 24 articles led to 21 potential articles relevant in this systematic review and were thus eligible for quality appraisal. • Levels of AI detected are not between the acceptable range defined for original productsa (quantitative) • Levels of active pharmaceutical ingredients (AI) detected are between the defined range of the declared formulation defined by the individual studya (quantitative) Qualitative and quantitative analysis according to the suggested classification of Neves , and Weber and colleagues into original, substandard or counterfeit and subclassifications with some adaptions for analysis Classification of prohibited substances coded according to the WADA prohibited list (updated version as of 01 January 2021) Substitution means that different active ingredients than that indicated on the label are included, whereas adulteration refers to more, or not all active ingredients that are included as indicated on the label. Injectable testosterone, synthetic AAS, other hormones and adjunctive therapies can easily be purchased over the internet and are delivered to a consumer’s home without prescription 4, 6, 8. Due to lack of reporting, precise prevalence and demographic information on the use of these substances is challenging . Historically, the majority of AAS users were professional or competitive athletes, but nowadays survey data has revealed that over 75% of AAS users are non-competitive bodybuilders or athletes, who are mostly motivated by cosmetic benefits over performance enhancement from AAS use 4, 6, 8–13. In this systematic review we demonstrate that the real composition, the type of production, concentration, quantity, quality, and purity are often not declared on the label, and labels are even misleading. Different non-scientific and anecdotal patterns and duration of use are described in literature with the goal of minimizing side effects or maximizing the drug effects of AAS 1, 15. It is described as continuous or chronic AAS use, despite prominent adverse medical, psychological, or social effects . With this systematic review and meta-analysis, we present significant findings for fake AAS on the black market. We demonstrate that candy96.fun visual inspection of the package, label, and internal content to identify preliminary signs of counterfeiting of AAS have shown to be mostly ineffective. In Europe, AAS from the black market appear to be more likely to be substituted and less likely to be inert, but also less likely to be over-concentrated compared to Brazil. We have evidence to suggest that Crazy Bulk’s legal steroids do work, based on our anecdotal experience of patients trying their supplements. There are no banned substances in any of Crazy Bulk’s legal steroids; therefore, users will pass any type of drug test while taking them. 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Proportions of counterfeit anabolic androgenic steroids from 18 studies, grouped by geographical region We searched PubMed/Medline, Embase and Google Scholar for studies published before March 29, 2022 that analyzed the quality and quantity of AAS to determine the proportions of substandard and counterfeit products found on the black market. The effect of supraphysiologic doses of anabolic androgenic steroids (AAS) candy96.fun on muscles, especially combined with strength training, has been described and recognized in literature for decades 1–5. Supraphysiologic doses of anabolic androgenic steroids (AAS) are widely used to improve body image and sport performance goals. The quality and authenticity of your steroids are directly linked to your results and health. This section focuses on one of the most critical aspects of using anabolic steroids—finding reliable and legitimate suppliers. 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