Grey Reducer or Hair Lightener?

I'm Male, and just turned 50.
My blonde hair is starting to go grey in patches. I may just let it go naturally grey, but what are the alternatives?
I've looked at Control GX (they have a version for blonde Men), but will it just turn the grey and blonde to dark?
Also I've looked at hair lighteners such as Sun In, or maybe just lemon juice?
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