Early detection and help-seeking for mental ill-health is associated with faster recovery and less intensive treatments. This has benefits for the health and well-being of the individual, but also for the workplace through increased productivity and lower costs associated with rates of worker absenteeism and presenteeism. There is evidence to suggest that rates of help-seeking for mental health among frontline workers is low. This may be due to poor self-awareness of own mental health, fear of stigma, concerns about impact on career trajectory, or uncertainty where to seek help. In the bid to create healthy workplaces and environments for their staff, some frontline agencies are implementing mental health screening, with the aim to promote early detection of mental health conditions and prompt timely help-seeking among staff. This presentation will discuss the findings from the largest randomised controlled trial evaluating mental health screening among frontline workers conducted to date, and the implications of these findings for workplaces. Results from this trial suggest mental health screening is not effective in increasing help-seeking behaviours or reducing levels of psychological distress, even when screening is implemented independently to the organisation and provides recommendations to free evidence-based treatments. Alternatively, upskilling managers through skills-based training in how to have conversations with staff about mental health matters, how to best support workers who are experiencing or at risk of experiencing mental ill-health, and how to facilitate help-seeking can have a more positive effect on employee mental health and recovery. Evidence to support the implementation within frontline agencies of manager mental health training to foster supportive environments that prioritises the mental health and well-being of frontline workers will be presented.