The crystal stuff helps me to sweat less, but it did very little for the odour (which is surprising because it's the opposite of what it claims to do)

My routine now is to use the crystal, then put a drop of diluted (skin safe) tea tree oil on a cloth and rub that on my pits.

At first the tea tree oil was just to disguises the odour, but after a few weeks even if I forgot the tea tree one day the odour was much improved. My theory is that the antimicrobial properties of tea tree combined with the crystal have worked together to prevent the bacteria and yeasts that make odour worse.

I like the crystal because I have circulation issues and it causes hyperhidrosis in my peripheries, so I've been able to use it on my hands and feet too. I don't want my hands to smell like deodorant but I do want them to be less wet. It doesn't help the numbness, coldness and blue skin, but it's less embarrassing to just have zombie hands than to have soggy zombie hands.

The crystal works well for me, provided I wash my pits (with soap) before applying it. Every time.

But the best product I've used is the clear gel antiperspirant from Mitchum. Unfortunately, that's stained so many of my shirts, and I hate that so much.

None of the natural or baking soda-based deodorants work well for me, or I tend to develop irritation within about a week of regular use.

It really is different for everyone!