08 Feb 2016 Blackmores Institute Zinc supplement boosts immunity in older adults RCT 08 Feb 2016 Share Share on LinkedIn Share on Facebook Share on Twitter Share on Google+ Share on Pinterest News Older people given zinc supplements to address deficiency also had an enhancement in their T cell function, a recent trial shows. The immune system weakens as the body ages, making older adults more susceptible to infections. Low levels of zinc impair immunity, particularly in older adults. × To continue reading this article, please Log In or Sign Up for access.