The Question I Hear Ten Times a Day
"Doctor, how many cc of Rejuran do I need?"
I hear this about ten times a day. It's basically the skincare version of standing at a fast-food counter: "Medium fries or large?"
Here's the problem. With fries, you just check how hungry you are. With Rejuran, you need to know how hungry your skin is. And most skin? Never tells you. (Rude.)
So today, as a certified Rejuran Key Doctor here in Gangnam, Seoul, I'm breaking down the difference between 2cc, 4cc, and 6cc as simply as possible, and as funny as possible. (I'm trying, okay?)
Read to the end, and you'll walk into your consultation and say "I'm clearly a 4cc person" before your doctor even opens their mouth.
Wait, What Even Is Rejuran?
The main ingredient in Rejuran Healer is PN (polynucleotide). Long name, I know. Just remember it like this: "skin renovation materials, sourced from salmon."
Yes, that salmon. The one you eat as sashimi, put on bagels, and now apparently invite onto your face. Rejuran uses purified DNA fragments extracted from salmon, injected into the skin. Yes, it's the famous "salmon sperm facial" you've seen on TikTok. Let's just say "salmon DNA" and keep things classy.
Think of your skin as an old house. Over time, the wallpaper starts peeling (fine lines), the floors sag (loss of elasticity), and the pipes start leaking (dryness).
Rejuran isn't a demolition-and-rebuild. It's more like a careful renovation, room by room. It helps create an environment where your skin can repair itself. So it's not an instant "ta-da, new face!" treatment. It's the kind where your skin texture quietly gets better over time, and one day your friend asks, "Did you do something?"
And what matters most in any renovation? How much material you use. Which brings us to today's main event: volume.
2cc, 4cc, 6cc: It's Basically Your Coffee Order
You know Tall, Grande, and Venti? Rejuran volumes work exactly the same way. Same coffee, different amount. The formula doesn't change. What changes is how wide and how densely it gets placed in your skin.
2cc = Tall: "Let me just try a sip"
Perfect for first-timers, or anyone whose skin isn't falling apart yet but who wants to get ahead of things. It's also popular for basic full-face coverage, or for focusing on one problem area like the under-eyes.
In short, it's the official starter size for people who think, "I'm curious, but a Venti on day one feels like a lot."
4cc = Grande: "If I'm doing this, I'm doing it right"
For people juggling several concerns at once: dryness, fine lines, pores, dull and tired texture. With more volume, we can cover the same face much more densely and reach every corner.
Honestly, a lot of patients come in planning on 2cc, then switch to 4cc once we look at their skin together. That's the moment their skin finally confesses: "Okay fine, I was a little hungry."
6cc = Venti: "The face alone isn't enough"
For people who want to treat the neck along with the face, or whose skin has thinned and lost elasticity across a larger area that needs thorough coverage.
The neck gets ignored in most skincare routines, so it's often the first place to give away your age. Face says 25, neck says 45. This "face and neck living separate lives" situation is more common than you'd think, and 6cc can be a solid choice for it.
"So 6cc Is Obviously the Best, Right?" Hold On.
\Here comes the classic follow-up: "Isn't more always better?"
Well... what happens if you dump an entire bucket of water into a tiny houseplant pot? Does the plant suddenly grow three times bigger? Nope. Your windowsill just becomes a swimming pool.
Skin works the same way. If the treatment area is small, cranking up the volume doesn't multiply the results. What matters is the right amount for your skin's size and condition. Your friend got 6cc? Cool. That doesn't make 6cc your answer.
And here's the real insider tip: with Rejuran, the number of sessions often matters more than the volume. Instead of one big session, we usually recommend a series spaced about 2 to 4 weeks apart. Going to the gym for 10 hours once won't beat showing up regularly, right? Same deal. Your skin notices consistency.
Of course, the exact number of sessions and spacing depend on your skin, so it's best to decide that together during your consultation.
The 3-Second Cheat Sheet
If you scrolled straight down here, I see you. No judgment. This table alone gets you halfway there.
Just remember, this is a general guide only. Two people of the same age can have completely different skin thickness, lifestyles, and concerns. The right volume is best decided after a doctor actually looks at your skin.
Real Questions From the Consultation Room (Honest Answers Only)
Q. Does it hurt?
I'll be honest: anyone who tells you "it doesn't hurt at all!" is lying. We apply plenty of numbing cream beforehand, which helps a lot, but you'll still feel some stinging. Most people say, "That was way more bearable than I expected."
Q. Can I go straight back to work afterward?
Right after treatment, you'll likely see small raised bumps where the injections went in. People call them "bubble wrap bumps," and they usually settle within a day or two. If you have something important coming up, give yourself a few days of buffer. First date tomorrow? Maybe reschedule the Rejuran.
Q. Will one session be enough?
As mentioned, Rejuran is a treatment that builds up over time. Some people notice a texture change after just one session, but we usually recommend a series.
Q. Can I start with 2cc and go up later?
Absolutely! Starting with 2cc to see how your skin responds, then adjusting next time, is a great approach. It's just like trying a Tall first, liking it, and ordering a Grande next time.
Q. I'm visiting Seoul. How should I plan around my trip?
Great question, and a very common one! A few tips for our international visitors:
Book early in your trip, not the day before your flight. This gives the bumps a few days to settle before you head home, and leaves room for a follow-up check if needed.
Skip the sauna, jjimjilbang, and heavy drinking for a few days after treatment. We know, Korean BBQ and soju are calling. They'll still be there.
Wear sunscreen and a hat while sightseeing. Seoul's sun is no joke, especially on freshly treated skin.
Ask about planning a series. If you visit Korea regularly, we can map your sessions around your travel schedule.
- Bring your skincare and medication list to the consultation, so we can check what's safe to use afterward.
The Key Doctor's Final Word
Here's the whole thing in three lines:
- 2cc if it's your first time or you're targeting one area
- 4cc if you've got several concerns across your face
- 6cc if you want to take care of your neck too
But the real answer? Your skin already knows. The problem is, it won't tell you. So my job is basically being your skin's translator.
Being selected as a Rejuran Key Doctor reminded me of something: with the exact same product, results depend on who gets it, where it goes, and how much. So don't stress over the cc count alone. Come in for a consultation, and we'll find your perfect size together. Tall or Venti, we've got you.
If you made it this far, congratulations: you now know more about Rejuran than 99% of the internet. Likes and comments make this doctor do a happy dance.
Disclaimer: Individual results and satisfaction may vary depending on skin condition. Temporary redness, swelling, stinging, dryness, or sensitivity may occur after treatment. Please consult a medical professional before deciding on any treatment. This post is for general information and is not a substitute for medical advice.
