My church WhatsApp group and my friend's son, he sell health products near Wong Tai Sin, tell me take big vitamin C every day, 1000 mg tablets and sometimes the fizzing glass, then you never catch flu or cold, the immunity so strong virus cannot enter. He say doctor medicine not necessary if you supplement enough. I have type 2 diabetes, sugar is 7 point something. Last year I go clinic for flu jab, this year I no go anymore — why need jab when I take vitamin C already, is same thing protection. Also my glucose meter, I stop checking it, my wife scold me but I tell her vitamin C boost immunity, medicine unnecessary, checking make you stress and stress raise sugar anyway. My mahjong brother Auntie Ling her husband take vitamin C three winter no cough once, true story. So I want ask: can I just take vitamin C instead of my flu jab? And with diabetes like me, do I still need to check my sugar if I eat the vitamin every day?