Does the Medicube EGF NAD+ serum help with smile lines?

Short answer: for me, yes, on the lines that show when I smile. Not overnight, and not like a filter. It took weeks of using it the same way every time before I noticed my smile lines looked softer in my own mirror, in my own lighting, with no ring light.

I am putting this in writing because the TikTok was short and a lot of you asked the same three questions in the comments. What is actually in it, how do I use it, and who should not bother. So here is the honest version.

What is in the Medicube EGF NAD+ Firming Serum?

The two ingredients on the label that matter are EGF and NAD+. EGF is a peptide-type ingredient. NAD+ is the one everyone is hyped about right now. Together the idea is that they support the look of firmness and smoothness over time. That phrase "over time" is doing a lot of work. This is a consistency product, not a quick fix product.

I want to be clear about what it is not. It is not filler. It is not a filter. It does not change the structure of your face. What I saw was the surface looking smoother and more hydrated, and that made the creases I get when I smile look less deep. Results vary and mine took weeks, not days.

This is a different product from the Medicube PDRN Pink Peptide Serum, which I also talk about a lot. People keep mixing them up. Pink Peptide is the pink one. EGF NAD+ is the firming one. If you want the one from this video, check the name on the bottle before you buy.

How do I use the NAD serum on smile lines?

Two drops. That is it. I press it into the lines with my ring finger instead of rubbing it across my whole face. Rubbing just spreads it thin and you end up with nothing where you actually wanted it.

• Start with three times a week. Your skin needs a minute to get used to a new active.
• Once there is no tightness or stinging, move to daily.
• Apply on clean, damp skin, before your moisturizer.
• Press, do not rub. Focus on the smile lines and the corners of the mouth.

I use mine at night. In the morning I keep it simple, cleanse, moisturizer, sunscreen. Sunscreen matters more than any serum if you care about lines, and I will keep saying that until it is boring.

How Korean skincare "actually works" on lines

This is the part I said in the video that got people upset. Korean skincare is not magic. The reason it works for so many people is that the routines are built around consistency and barrier support instead of one harsh active that you quit after a week because your face is peeling. The NAD serum fits that. It is gentle enough to use daily, so you actually use it daily, so you actually see something.

Who this is not for

• If your barrier is already irritated from acids or retinol, calm it first. Adding another active to angry skin is how you end up with a red face and a bad review.
• If you want a visible change in a week. That is not this product. Give it a month before you decide.
• If you are already happy with a firming serum that works for you. You do not need two.
• If you are on a tight skincare budget. Sunscreen and a moisturizer you love come first. This is a nice-to-have, not a need.

Red flags to watch for

There are a lot of listings for this serum right now, some from random sellers. Buy from the Medicube store or a listing that clearly says it is sold by the brand. If the packaging looks off or the text is blurry, send it back.

I do not have an affiliate link for this one, so this is just the Amazon search so you can find the real listing: Medicube EGF NAD+ Firming Serum on Amazon.

No brand deal. No PR obligation. Just ingredients and what I actually saw.