'On Guard' is the wonderfully succinct and informative second book by Clinical Nutritionist and Functional Medicine practitioner Gaynor Greber.

Written for the lay-person in three, easy-to-understand sections, Greber presents various options for optimising health and building a strong and resilient immune system.

She includes information on how the immune system functions, correct diet and lifestyle choices for strengthening the immune system, and medicinal plants and supplements that can be used to gently stimulate the immune system by natural means and allow it to function as nature intended. If we do this, then we can build resilience, boost immunity and beat infection.