The hardness of tablets, defined as the breaking force that causes tablets fracture, was determined using a hardness tester (Tablet hardness tester TBH 125, Erweka, Warsaw, Poland) in agreement with the USP 43-NF 38 guideline; <1217> chapter “Tablet breaking force” [34]. The measurement was carried out for 10 tablets of each dietary supplement and expressed as an average value ± standard deviation.
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