| Summary: | Comparative estimations of the antioxidant activity of methanolic extracts from biomasses of different types of in vitro cultures of <i>Cistus × incanus, Verbena officinalis, Scutellaria lateriflora</i>, and <i>S. baicalensis</i> and also from plant raw materials were performed. The antioxidant measurements were based on the modern assays—cupric ion reducing antioxidant capacity (CUPRAC) and quick, easy, new, cheap, and reproducible CUPRAC (QUENCHER-CUPRAC). The total extractable antioxidants (CUPRAC assay) ranged from 10.4 to 49.7 mmol (100 g)<sup>−1</sup> of dry weight (DW) expressed as Trolox equivalent antioxidant capacity (TEAC), and the global antioxidant response (QUENCHER-CUPRAC assay) ranged from 16.0 to 79.1 mmol (100 g)<sup>−1</sup> DW for in vitro cultures, whereas for plant raw materials the total extractable antioxidants ranged from 20.9 to 69.5 mmol (100 g)<sup>−1</sup> DW, and the global antioxidant response ranged from 67.2 to 97.8 mmol (100 g)<sup>−1</sup> DW. Finally, the in vitro cultures could be regarded as an antioxidant-rich alternative resource for the pharmaceutical, health food and cosmetics industries.
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