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~ Dee

Does glycolic acid expire?

I bought some a few years ago & I still have it. It's in a cobalt blue glass jar.. There's no expiration date on it.

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Yes I think it weakens over time. I bought one with 30% concentration 2 years ago and its weakened considerably since then so I had to buy another one.

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Thanks. I'm not real sure how many years old it is, I know it's over two... Think I'm gonna toss it.

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Thanks. I'm not real sure how many years old it is, I know it's over two... Think I'm gonna toss it.

Hydroxyacetic acid has a half life of 373.8 days.

So, it takes about 7 years for it to become about 0.75% concentration.

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