Background: ''Biological plausibility is a concept frequently referred to in environmental and public health when researchers are evaluating how confident they are in the results and inferences of a study or evidence review. Biological plausibility is not, however, a domain of one of the most widely used approaches for assessing the certainty of evidence (CoE) which underpins the findings of a systematic review, the Grading of Recommendations, Assessment, Development and Evaluation (GRADE) CoE Framework.& nbsp;Objectives: Whether the omission of biological plausibility is a potential limitation of the GRADE CoE Framework is a topic that is regularly discussed, especially in the context of environmental health systematic reviews.& nbsp;Study Design and Setting: We analyze how the concept of ''biological plausibility, as applied in the context of assessing certainty of the evidence that supports the findings of a systematic review, is accommodated under the processes of systematic review and the existing GRADE domains.& nbsp;Results: We argue that ''biological plausibility is a concept which primarily comes into play when direct evidence about the effects of an exposure on a population of concern (usually humans) is absent, at high risk of bias, inconsistent, or limited in other ways. In such circumstances, researchers look toward evidence from other study designs to draw conclusions. In this respect, we can consider experimental animal and in vitro evidence as ''surrogates for the target populations, exposures, comparators, and outcomes of actual interest. Through discussion of 10 examples of experimental surrogates, we propose that the concept of biological plausibility consists of two principal aspects: a ''generalizability aspect and a ''mechanistic aspect. & nbsp;Conclusions: The ''generalizability aspect concerns the validity of inferences from experimental models to human scenarios, and asks the same question as does the assessment of external validity or indirectness in systematic reviews. The ''mechanistic aspect concerns certainty in knowledge of biological mechanisms and would inform judgments of indirectness under GRADE, and thus the overall CoE. Although both aspects are accommodated under the indirectness domain of the GRADE CoE Framework, further research is needed to determine how to use knowledge of biological mechanisms in the assessment of indirectness of the evidence in systematic reviews. (C) 2022 The Author(s). Published by Elsevier Ltd and Elsevier Inc.& nbsp;