Can you moisturize too much?
Sort of.
But probably not in the dramatic “your skin forgot how to moisturize itself” way people sometimes describe.
Your skin does not become lazy
Using moisturizer does not teach your skin to permanently stop doing its job.
You are not creating a lotion addiction.
But you absolutely can use a product that is:
too heavy
too occlusive
too irritating
or simply wrong for your skin
and then create problems.
More product isn't always more benefit
If a pea-sized amount keeps your face comfortable, applying half the jar isn't going to make your barrier five times healthier.
Eventually you're just greasy.
Rich products can be too much for some skin
Especially on the face.
If you're prone to congestion, a very heavy layer of balm multiple times a day may not agree with you.
That doesn't make the moisturizer bad.
It means you used more richness than your skin wanted.
Occlusion can also trap things
A heavy layer over irritated skin can sometimes feel soothing.
But heavy occlusion over sweat, friction or certain active ingredients can also intensify irritation.
Context matters.
How do you know you're using too much?
Your skin may feel:
greasy for hours
congested
hot
itchy
covered rather than comfortable
Reduce the amount.
See what happens.
The goal isn't moisturized-looking skin
It's comfortable skin.
Soft.
Supple.
Not tight.
Not irritated.
Not coated in a centimetre of product because somebody told you more is better.
How often is enough? Read How Often Should You Moisturize Dry Skin?