Total phenolics content and DPPH• scavenging activity in P. djamor fruiting bodies depending on Mg salts supplementation. (a) Total phenolics content; (b) DPPH• scavenging activity. Each bar represents mean value ± standard deviation. Bars marked with different letters (a,b,c,d,e,f) are significantly different p ≤ 0.05 according to Tukey’s test, N = 6. MgCl2 × 0.5—210 mg of Mg; MgCl2 × 1—420 mg of Mg; MgCl2 × 10—4200 mg of Mg (in the form of MgCl2 per 2 kg of substrate); MgSO4 × 0.5—210 mg of Mg; MgSO4 × 1—420 mg of Mg; MgSO4 × 10—4200 mg (in the form of MgSO4 per 2 kg of substrate); C—standard growing medium.