Meanings of nontoxic concentrations in English

We hypothesized that those drugs might have synergistic effects enabling successful therapy with low, nontoxic concentrations.

Virus yield was significantly reduced at nontoxic concentrations, which did not suppress RNA or protein synthesis in uninfected or PV-infected cells.

Interestingly, both compounds displayed EPI activities at nontoxic concentrations for human cells as well as highlighted promising results by preliminary pharmacokinetic studies.

Inhibition of cPLA2a at nontoxic concentrations attenuates migration of highly metastatic 4T1 cells, but not non-metastatic 67NR cells.