Natural health: 'I have dandruff which is embarrassing'; 'I’m covered in painful mosquito bites'

I have dandruff which is embarrassing, especially as I need to wear dark suits to work. I’ve tried dandruff shampoos but the results are limited. What would you recommend?

When shopping for shampoo, it’s best to avoid the following ingredients: parabens, sodium laureth and sodium lauryl sulphate, fragrances (also listed as parfum on some labels), propylene glycol, DEA (Diethanolamine), MEA (Monoethanolamine) and TEA (Triethanolamine), artificial colouring, phthalates, and triclosan.