Is a Korean EGF + NAD+ firming serum worth it for sagging?
If you are dealing with mild sagging and smile lines, a Korean EGF + NAD+ firming product can be worth it as one part of a consistent routine, not a one-off fix. EGF (epidermal growth factor) is used in skincare to support the skin's own renewal, while NAD+ ingredients are included to help look after skin that feels tired and less bouncy.
The results you can expect are gradual improvements in smoothness and firmness over weeks of regular use, rather than instant lifting. Below we explain who benefits most and which pieces from our Korean cosmetics range fit together.
For mature skin wanting a firming, collagen-focused weekly treatment alongside daily serums.
For those whose smile lines and crease lines show first around the eyes and want a NAD+ and retinol eye option.
For over-40 skin that wants a daily peptide ampoule focused on a firmer, smoother look.
For drier, mature skin wanting a richer peptide cream to seal in serums and support a plumper feel.
For anyone wanting a ginseng and peptide toner to prep skin before the rest of a firming routine.
What EGF and NAD+ actually do for firmness
EGF is a protein-based ingredient added to serums to support the skin's natural repair and renewal processes, which many people associate with a smoother, firmer-looking surface over time. NAD+ ingredients are used in skincare to care for mature skin that feels depleted and lacks resilience.
Neither one is a filler or a muscle treatment, so they will not erase deep folds or replace a clinic procedure. What they can do is contribute to a plumper, more even look when used daily alongside sun protection.
Who benefits most
This type of serum tends to suit mature and over-40 skin where you notice softening along the jaw, cheeks and nasolabial folds, plus fine smile lines. If your main concern is dehydration or breakouts rather than loss of firmness, a firming serum is less of a priority.
Peptides are a natural partner here: they are widely used for a supple, firm feel, so a routine that pairs EGF or NAD+ with peptide products often makes sense.
How to use it and what to avoid
Introduce one active product at a time and start a few times a week before building to daily use, so you can see how your skin responds. Apply firming serums to clean skin, then seal with a moisturiser, and always use sunscreen in the morning.
Patch test any new product on the inner arm or jawline first, and avoid layering several strong actives at once if your skin is reactive. If you use prescription treatments, check with your doctor before adding new serums.
How it fits a full routine
A simple firming routine can run from a toner that preps the skin, to a peptide or NAD+ serum, a richer firming cream, and a weekly mask for an extra boost. Eye areas often show smile and crease lines first, so a dedicated eye product can be a useful addition.
For the EGF + NAD+ angle specifically, Medicube's NAD+ line is a sensible starting point, which you can support with the peptide picks below.