PDRN Salmon Injection: 7-Day Home Care Tips to Double the Effect

Information as of June 2026

Care Guide to Maximizing Regeneration

• Extends the duration of effects by 30% with care within 72 hours
• Optimal re-treatment cycle: 4-6 weeks
• Twice the difference in regeneration speed with care during the first week

Immediately After Treatment, the 72 Hours When Regenerative Capacity Is Determined

Half of those who give up after just a week of PDRN treatment, claiming 'no significant effect,' the first 3 days "I noticed they all had one thing in common: they neglected proper care. In fact, the activity of fibroblasts, which produce collagen, is highest during the 72 hours immediately following the procedure. Depending on how well the inflammatory response is reduced during this period, the speed of regeneration can differ by more than double." PDRN (Polydeoxyribonucleotide) is a DNA fragment extracted from salmon sperm; its principle is to activate A2A receptors to aid in angiogenesis and cell regeneration. Representative products include Rejuran and Pynoblend, and the FDA approved it for tissue regeneration purposes in 2018. The problem is that the injection needle can leave microscopic damage to the dermis, potentially causing a temporary inflammatory response. If you do not apply a cold compress within 6 hours after the procedure, swelling may persist for more than 48 hours. If this happens, fibroblasts may not be properly activated.

According to the 2021 guidelines of the Korean Dermatological Association, applying an ice pack for 10 minutes, three times immediately after the PDRN procedure, reduces the duration of swelling by an average of 30%. However, since applying ice directly to the skin poses a risk of low-temperature burns, please wrap the ice in gauze or a thin towel before applying the compress.

Caution You must absolutely avoid washing your face with hot water on the day of the procedure. It is best to rinse gently with lukewarm water (below 30 degrees Celsius) using only lather, and remove moisture by patting with a towel. If you rub it, the bruising can spread at the injection site.

• Cold compress for 10 minutes x 3 times within 6 hours after the procedure; 30% reduction in swelling duration
• Fibroblast activity levels are high during the first 72 hours; inflammation management during this period determines the effectiveness
• Washing with lukewarm water (below 30 degrees) + rinsing with only lather = stabilization of the injection site

Weekly Care Checklist: From Washing to Exercise

The first week after the procedure is a very important period during which PDRN settles well into the dermis layer and sends regeneration signals. During this period, high-intensity exercise, saunas, and alcohol consumption can drastically increase blood flow, potentially causing the injected ingredients to migrate from their original location. Rinse your face with water only for up to 48 hours, and it is recommended to start using cleansing foam on the third day. It is safe to lather a foaming cleanser sufficiently in your palms, apply it to your face, and rinse it off within 10 seconds. It is best to avoid using scrubs, peels, or exfoliants for two weeks. It is recommended to switch your cosmetics to focus on moisturizing starting from the day of the procedure. Stop using exfoliating ingredients such as retinol, AHA, and BHA for a week, and try switching to products containing ceramide, hyaluronic acid, or panthenol. We often recommend CICA creams in the clinic because they have good synergy with PDRN regeneration.

Exercise is only okay up to a heart rate of 120 or less. Walking and yoga are fine, but it is best to wait a week before resuming exercises like running, weight training, or cycling. Excessive sweating can allow bacteria to enter the pores, increasing the risk of inflammation.

You must avoid alcohol and tobacco for at least 72 hours.

Alcohol can cause blood vessel dilation, making bruises worse, and nicotine can reduce blood flow, slowing the regeneration rate by more than 30%.

Timing	Cleansing	Cosmetics	Exercise·Lifestyle
Same day~48 hours	Rinse with water only	Moisturizer only (Discontinue retinol)	Cold compress·Rest
3~7 days	Foaming cleanser (within 10 seconds)	Ceramide·Cica Cream	Exercise with a heart rate of 120 or less
8 days to 2 weeks	Normal cleansing is possible	Exfoliation can be resumed	High-intensity exercise can be resumed

Recovery speed may vary depending on individual skin condition.

Retreatment cycle, when is the optimal time?

Research results show that collagen density is highest when PDRN is treated 3 consecutive times at intervals of 4-6 weeks, rather than just once. However, if the interval between re-treatments is within 2 weeks, inflammation may actually accumulate, and if it is longer than 8 weeks, the effects of the previous treatment may be diluted. Pharma Research Products, the manufacturer of Rejuran, recommends 3 treatments at 3-week intervals for initial intensive care, followed by maintenance treatments every 2-3 months. In domestic clinical trials, a 4-week interval is the most common; it is said that the rate of fibroblast proliferation reaches its peak when treatments are performed at this cycle. The biggest reason for missing the timing for re-treatment is often the misconception that "the effects are still remaining." While the regenerative effects of PDRN begin to appear from the 2nd week after injection, the rate of new collagen production decreases after 4 weeks. Additional treatments must be performed at this point to ensure that the regenerative wave continues without interruption. The treatment cycle can also be adjusted according to age and skin condition. For those in their late 20s to early 30s, a 5-6 week interval is sufficient, but it is recommended that those in their 40s or older, smokers, or diabetic patients schedule it more closely at a 3-4 week interval. The Ministry of Food and Drug Safety's approval guidelines also specify 'adjusting the interval according to individual skin condition.' Clinical: There are reports that applying a high-concentration vitamin C serum the day before a re-treatment slightly increases the absorption rate of PDRN. However, since retinol or AHA can weaken the skin barrier and cause adverse effects, it is best not to use them.

• Initial Intensive: Maximize collagen density 3 times at 3-4 week intervals
• Maintenance: Long-lasting effects 2-3 times a year at 2-3 month intervals
• Those 40+ · Smokers: Recommended to shorten to 3-week intervals

Why does the duration of effects vary from person to person?

Even after receiving the same PDRN treatment, some people feel that their skin is 'sagging again' after 6 months, while others feel it after just 3 months. The first factor creating this difference is daily UV management.

Ultraviolet rays (UVA) activate the MMP-1 (matrix metalloproteinase) enzyme, which breaks down collagen in the dermis. Even collagen painstakingly created with PDRN can be lost by more than 20% in just one month if exposed to UV rays without protection. It is said that there is an average difference of about two months in the duration of effectiveness between those who apply sunscreen with SPF 30 or higher every day and those who do not. The second factor is sleep and protein intake. Fibroblasts synthesize collagen most actively when growth hormone is secreted during sleep. There is even a study (Journal of the Korean Dermatological Association 2020) showing that if sleep of 6 hours or less per day persists for more than two weeks, the regeneration rate decreases by 40%. You need to consume at least 0.8g of protein per kilogram of body weight per day to ensure sufficient raw materials for collagen. If you make sure to eat good protein sources like chicken breast, eggs, and tofu with every meal, and consume Vitamin C (500mg per day) along with it, collagen synthesis can be promoted more effectively. The third factor is skin barrier care. Dry skin has a high TEWL (Transepidermal Water Loss), which can cause PDRN ingredients to evaporate quickly. For two weeks after the procedure, please reapply moisturizer at least three times a day to strengthen your skin barrier. Home Care Routine: Habits to Double the Effects of the Procedure The home care most recommended by clinics after PDRN treatment is a hypoallergenic LED mask. Clinical reports indicate that red light with a wavelength of 630nm stimulates fibroblasts to increase collagen production by an additional 20%. However, it is recommended to start using it on the third day after the procedure and limit usage to within 10 minutes at a time. It is best to apply Vitamin C serum as the first step after cleansing in the morning. A concentration of 10-15% is appropriate, and the L-ascorbic acid form has the best synergy with PDRN. However, since using it simultaneously with retinol can cause skin irritation, it is recommended to split the use between Vitamin C in the morning and Retinol in the evening. You can resume peeling two weeks after the procedure, but I recommend PHA (Polyhydroxy Acid) instead of AHA. Because PHA has large molecules that do not penetrate deeply into the dermis, it effectively removes dead skin cells without interfering with the PDRN ingredients. Massage can be described as a double-edged sword. A light touch that helps lymphatic circulation is effective, but applying strong pressure can cause the injection site to shift. For two weeks after the procedure, only apply light tapping with your fingertips, and it is recommended to wait a month before using rollers or lifting devices. Tip: After a PDRN procedure, applying an oil serum before a moisturizing cream results in a higher absorption rate. It is recommended to rub 2-3 drops of a hypoallergenic oil, such as squalane or jojoba oil, between your palms to warm it with body heat, then apply it to your face by pressing gently.

• LED Mask (630nm) 3 times a week, 20% increase in collagen production
• Vitamin C Serum (10-15%) every morning, antioxidant + regeneration synergy
• PHA Peeling (after 2 weeks), exfoliates while minimizing irritation to the dermis

Key Summary: Priorities of PDRN Care

To maximize the effects of PDRN treatment, it is recommended to prioritize in the following order: Inflammation management for the first 72 hours, 1 week of lifestyle control, 4-6 weeks of re-treatment timing, and long-term UV protection. If you miss even one of these four steps, the regeneration speed can drop to less than half. The re-treatment cycle can be adjusted according to age, skin condition, and lifestyle, but you must strictly adhere to a 3-4 week interval for the initial 3 sessions to ensure sufficient collagen density increases. Once you move on to the maintenance phase, it is fine to adjust the frequency every 2-3 months.

• First 72 hours cold compress + lukewarm water cleansing = Securing the foundation for regeneration
• Avoid high-intensity exercise, sauna, and alcohol for 1 week = Ingredient settling
• Initial 3 times (at intervals of 3-4 weeks) maintenance (at intervals of 2-3 months) = Long-term effect
• SPF 30 or higher daily + 0.8g/kg protein = Collagen protection

PDRN Post-procedure Care vs. General Care

Post-PDRN Procedure [Intensive Regeneration]

• Cleansing: Water only for 48 hours, starting from the 3rd day Foaming Cleanser
• Cosmetics: Discontinue Retinol/AHA for 1 week, switch to Cica/Ceramide
• Exercise: Heart rate 120 or lower, no sauna for 1 week
• UV: SPF 30 or higher required, reapply every 2 hours

The first 72 hours determine 50% of the effect

General Anti-Aging Care [Prevention-oriented]

• Cleansing: Double cleansing, cleansing oil may be used
• Cosmetics: Regular use of Retinol/AHA
• Exercise: No restrictions, saunas allowed
• UV: SPF 30, going outdoors Siman

Long-term habits are important

PDRN Management Strategies by Situation

Office workers, frequent lunch outings, and difficulty reapplying sunscreen

It is good to apply sunscreen with a tone-up + powder dual structure in the morning, and just reapply powder at lunchtime

Adding just SPF 15 powder can extend the UV protection effect by 40%

If you have dry skin or high TEWL (transurethral water loss)

Try switching to a routine of applying oil serum first and then layering with moisturizer for 2 weeks after the procedure.

The oil prevents the evaporation of PDRN ingredients and increases absorption rate by 20% It is possible

Those 40 and older, concerned about re-treatment intervals

The initial 3 sessions are spaced 3 weeks apart, and then adjusted to 8 weeks; however, it is recommended to consider re-treatment immediately if you feel a decrease in skin elasticity

As you age, the rate of collagen synthesis slows down, so the intervals must be shortened to ensure the effects last.

Common misconceptions

Misconception PDRN lasts for 6 months with just one injection

Truth The effect of a single treatment lasts an average of 2-3 months That is about right. To maintain the results for more than 6 months, it is necessary to perform consistent maintenance every 2-3 months after the initial 3 intensive treatments. The manufacturer's recommended protocol also specifies '3 consecutive treatments.'

Misconception It is okay to apply makeup immediately after the procedure

Truth If cosmetic ingredients enter the dermis before the needle mark has completely healed, there may be a risk of inflammation. It is recommended to avoid base makeup for at least 12 hours, and to lightly apply only a mineral cushion after 24 hours.

Absolutely Prohibited Actions After PDRN Procedure

• On the day of the procedure: Wash face with hot water (over 40 degrees), sauna, or steam room
• Use cleansing oil, scrub, or peeling agent within 48 hours
• High-intensity exercise (running, weight training, cycling, etc., heart rate over 120) within 1 week
• Drinking alcohol or smoking within 72 hours (worsens bruising due to vasodilation/constriction)
• Use cosmetics containing exfoliating ingredients such as retinol, AHA, or BHA within 2 weeks
• Rub the treated area vigorously or use massage tools (risk of ingredient migration)

Frequently Asked Questions Question

When can I wash my face after the PDRN procedure?

You can rinse with water only on the same day, but it is recommended to wait 48 hours before using cleansing foam. It is safe to lather the foam sufficiently in your palms, apply it to your face, and wash it off within 10 seconds. It is also recommended to avoid using scrubs or peeling agents for 2 weeks.

Exactly what is the best interval for re-treatment?

For initial intensive care, performing the procedure 3 times at intervals of 3-4 weeks can maximize collagen density. Subsequent maintenance care can be adjusted to intervals of 2-3 months. If you are over 40 or a smoker, it may be more effective to shorten the treatment period to 3 weeks. When can I start using Vitamin C serum? You can use it starting from the day of the procedure, and it is actually recommended because it has a synergistic effect with PDRN. However, it is best to limit the concentration to 10-15% and avoid using it simultaneously with retinol. It is safer to use Vitamin C in the morning and retinol in the evening. Do I need to stop exercising completely? You can start activities with a heart rate of 120 or less (walking, yoga) from the day of the procedure, but it is recommended to wait one week before resuming high-intensity exercises such as running, weight training, and cycling. If you sweat a lot, bacteria can enter the pores, increasing the risk of inflammation. What are the side effects or symptoms to watch out for after the PDRN procedure? Generally, swelling, bruising, and stinging within 48 hours are normal reactions. However, if swelling persists for more than 3 days or if the injection site becomes hot and red, it could be a sign of inflammation, so it is important to contact the clinic where you received the procedure immediately. Rarely, allergic reactions (itching, hives) may occur, in which case a prescription for antihistamines may be necessary. When do the effects appear? With PDRN, you will start to feel improvements in skin elasticity starting from the 2nd week after the injection, and the effects tend to reach their peak between 4 and 6 weeks. It is said that the effects tend to last even after 8 weeks when treated 3 consecutive times, compared to a single treatment.

This content is for informational purposes only and does not replace medical advice. PDRN treatment and aftercare methods may vary depending on individual skin conditions, so please be sure to consult a specialist before and after the procedure.

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