How can i make leather more flexible

Factual Questions
1

I just bought a watch with a leather band, the band isn’t flexible enough. What can i use to make the band more flexible. Is there anything cheap and/or household or do i need some special kind of leather softener.

If i make it too soft can i make it harder again?

2

Generally, use will make it more flexible. You could try neatsfoot oil, but that’s primarily to keep leather from drying out and cracking. It’s also made with animal fats, which may not be something you want next to your skin. You might try mineral oil.