Sample Preparation: 1 g of powder was dissolved in carbonate buffer (PH:9), 50μL of internal standard (17 α-methyl-testosterone, final concentration 500 ng/mL) were added and the extraction was performed with 10 mL of pentane in a multimixer for 5 minutes. The organic layer was separated and evaporated

under nitrogen at 70 °C. The dry residue was derivatized using 50μL of TMSJ at 75° C for 30 minutes. 2 μL of the derivatized layer were injected into a gas cromatograph connected to a mass spectrometer. Instrumental Conditions: GC/MS was performed on an HP 6890 mass selective detector (Agilent Technologies, Tokio, Japan) connected with a 5973 quadruple mass spectrometry, with ionization energy modality, at 70 eV and Compound C mouse SIM acquisition. The fused-silica ARN-509 solubility dmso capillary column used was HP1 with 0.20 mm diameter and 0.11 μm film thickness). Helium was used as a carrier gas (flow rate: 1 mL/min, split ratio 1:10). Statistical analysis Database management and all statistical analyses were performed using the Statistica 6 for Windows find more software

package (Statsoft Inc., Tulsa, OK). Normality of data was assessed by the Wilk-Shapiro’s test. Differences were analysed by means of the two-tailed Student’s t test. If a significant difference was present, a Dunn’s post hoc test was used to locate the difference. Levels of statistical significance were set to p < 0.05. Results Knowledge and use of nutritional supplements Overall, plant-derived nutritional supplements resulted poorly Resveratrol known among the 740 enrolled subjects. Indeed, 45% of them declared not knowing any of te substances in the list. 24% of them declared knowing only phytoestrogens,

26% only vegetal sterols and only 5% declared knowing ecdysteroids. Overall, the use of these substances resulted extremely limited among the enrolled subjects (3%). Health status The laboratory tests revealed the absence of any sign of organ toxicity/damage in all the subjects enrolled as shown in Table 1. Similarly, no significant differences between users and controls were found when considering the value of cortisol, LH, FSH, TSH, FT3, FT4 (Table 2). On the contrary, sex hormone profiles revealed marked alterations in 15 (65%) out of the 23 of investigated athletes, while no alterations were found in the control group (Table 2). Specifically, ten male subjects presented increased plasma levels of progesterone (Figure 1). Fifteen subjects presented abnormal estrogen levels, including 5 subjects (2 female and 3 males) presenting a “dramatic” increased estrogen values (Figure 2). Finally, two male subjects with increased estrogen levels (subjects 11 and 15 in Figure 2) presented concomitant increased testosterone levels associated with suppressed LH and FSH.