Make your own deodarant paste to prevent body odour

I wash my underarms more than once daily and have to change t-shirt, top, etc, during the day, (I use Elave products for hair and body wash).
In addition, I have irritation where my skin connects with the armhole in garments. I am 73, I regard myself as healthy, despite being on medication for A fib, osteoporosis and psoriasis. I eat a good diet.