What is the correct punctuation for a repeated word?

I'm creating a presentation for school and I want to title my presentation "The not so secret secret to weight loss"

My meaning is that people act as if it is a secret when in fact it is very common knowledge. Do I need a comma between the two words or a hyphen? Or is it fine the way it is?

Thanks!


“The not-so-secret secret to weight loss.” In this case, “not-so-secret” is the adjective describing the “secret to weight loss.” No commas.