Which is the best nail strengthener?

[peaceanddove]

I've been a fan of Nailtiques 2 for years but you just can't seem to source it anymore. Can anyone please recommend something similar? x

[DartmoorChef]

My mum used to swear that eating a cube of jelly a day worked and to be fair her nails were amazing.

[Auldspinster]

I like Sally Hansen Hard as Nails.

[Spaceprincess]

OPI Nail Envy is amazing

[Darklane]

I’m missing Nailtiques too, down to the last dregs of my last bottle. Saw some on Amazon this week for £100+ a bottle! I heard that their factory had burned down, don’t know how true.
I’ve bought some Sally Hansen Maximum Growth to try. Nail Envy doesn’t work for me.