Suppressed immune system / immune booster?
hey you good folk, any advice for a good immune booster? I'm well into the training for my first sprint triathlon at 47 but being blighted by colds, infections and generally feeling unwell.... it appears my immune system is suppressed and I'm guessing that 5/6 days a week training could be partly the problem. I've spent most of my recent adult life not being that active so it's all been a bit of a shock to the system!! I'm not reducing the training as i want to achieve a respectable time so would rather just boost the old immune system. Is this a common problem experienced? What remedies have you guys come across? Many thanks in advance for any advice.