isoi Serums

The isoi serum range on skinsli groups into three functional lines:

• Lifting and Elasticity: Core Elasticity Serum 35ml and Intensive Lifting Serum 35ml. These two serums are closely related - the Core Elasticity Serum addresses the baseline collagen-support and skin structure work, while the Intensive Lifting Serum is a step up in potency for more visible lifting and firming. Both come in the same 35ml format.
• Pore Control: Pore Tightening Control Serum 50ml. A single targeted formula focused on minimising enlarged pores, controlling excess sebum, and improving skin texture around pores.
• Blemish Care: Blemish Care Serum 70ml, Blemish Care Serum Plus 50ml, Blemish Care Up Serum in 15ml, 25ml, 30ml, and 70ml large-capacity. This is the most developed serum line in the isoi range - multiple formulations and sizes addressing different stages and intensities of blemish-prone skin care.

The Core Elasticity Serum 35ml is isoi's baseline anti-aging serum. Its focus is on collagen and elastin support - the structural proteins that give skin its firmness and elasticity. These proteins degrade with age, UV exposure, and oxidative stress, leading to the visible signs of skin aging: sagging, deepening wrinkles, and loss of contour.

The serum works through actives that support fibroblast activity (the cells that produce collagen and elastin) and protect existing structural proteins from further degradation. The effects are cumulative - visible results require consistent daily use over 4 to 8 weeks minimum.

Best suited for:

• Skin showing early signs of elasticity loss - mild sagging, flattening of cheekbones, early jowl appearance
• Preventive use for skin in the 30s that wants to maintain baseline firmness before visible loss occurs
• As a supportive serum in combination with other targeted treatments (vitamin C, retinol) where elasticity support is needed but not the primary focus

The Intensive Lifting Serum 35ml is the step up from the Core Elasticity Serum. 'Intensive' and 'lifting' in the product name point to a higher active concentration and formulation angle that prioritises the visible firming and contour-lifting effect over the broader collagen-support work of the Core Elasticity formula.

Choose the Intensive Lifting Serum if:

• You have already used a basic elasticity serum and want to progress to a stronger formula
• Visible sagging or loss of facial contour is your primary concern rather than fine lines or general aging
• You want a serum specifically designed to address the lower face and jawline area, which is typically where lifting serums perform most visibly

The same application principles apply: apply after toner, before cream, press in with gentle upward motions. Upward application direction is not clinically proven to lift skin physically, but it avoids inadvertently pulling skin downward during application which can contribute to repeated physical stretching over time.

The Pore Tightening Control Serum 50ml addresses one of the most commonly cited Korean skincare concerns: enlarged and visible pores. While pore size is largely determined by genetics and skin type, pore appearance can be effectively managed through consistent targeted care.

What the serum does:

• Astringent action: Tightens the skin surface around the pore opening, temporarily reducing visible pore size. This effect lasts several hours and can be topped up with each application.
• Sebum control: Regulates excess sebum production that causes pores to appear larger (enlarged pores are most visible when they are filled with sebum).
• Skin texture improvement: Over consistent use, the combination of astringency and sebum control improves the overall smoothness and clarity of the skin surface around and between pores.

This serum works best on oily and combination skin where enlarged pores are primarily sebum-driven. On dry skin, pore appearance is less likely to be a concern, and the sebum-controlling aspects of the formula may be more drying than necessary.

The isoi Blemish Care serum line is the most extensive in the range, with multiple formulations and sizes. Understanding the difference between them:

• Blemish Care Serum 70ml: The standard large-capacity blemish serum. A comprehensive formula for daily use in acne-prone or blemish-active skin. The 70ml size reflects regular daily use rather than spot treatment.
• Blemish Care Serum Plus 50ml: An upgraded formulation with additional actives. The 'Plus' indicates a more potent or broader-acting version - appropriate if the standard formula has been used and a stronger version is needed.
• Blemish Care Up Serum (15ml, 25ml, 30ml, 70ml): The 'Up' positioning suggests this is a targeted spot treatment format - used precisely on active blemishes or problem areas rather than as a full-face serum. The multiple sizes allow for different use patterns: 15ml for travel or targeted use, 70ml for people who use it full-face daily.

A practical approach: use the Blemish Care Serum 70ml across the full face as a preventive and treatment serum, and keep the smaller Blemish Care Up Serum for spot treatment on active breakouts.

Korean blemish serums differ from standard Western acne treatments in their approach. Where many Western formulas lead with high-concentration active acids (benzoyl peroxide, salicylic acid at 2%+), Korean blemish serums tend to use a combination of lower concentrations of multiple actives alongside soothing and barrier-repair ingredients. The goal is to manage acne while keeping the skin barrier intact.

isoi's Blemish Care serums typically use combinations of:

• Mild antibacterial actives to control Cutibacterium acnes
• Anti-inflammatory ingredients to reduce active redness and swelling
• Sebum-regulating ingredients to reduce the primary trigger for new breakouts
• Barrier-supportive ingredients to prevent the dryness and flaking that often accompany more aggressive acne treatments

The result is a serum that can be used daily without the purging and dryness commonly associated with stronger acne treatments. For severe cystic acne, these serums are supportive rather than primary treatment - dermatological care remains appropriate for severe presentations.

Serums go after toner and before moisturiser. The standard Korean skincare routine position for a serum is:

1. Cleanser
2. Toner
3. Essence (if using)
4. Serum - isoi Elasticity, Pore Control, or Blemish Care
5. Moisturiser / cream - isoi Moisture Doctor or rose cream range
6. SPF (morning only)

If you are using two serums (for example, a vitamin C serum and an isoi Blemish serum), apply the lighter texture first and the heavier second. The general rule is thin-to-thick. Allow 30 to 60 seconds between serum layers for partial absorption before applying the next.

The isoi serum lines are designed to work within the full isoi ecosystem - they pair naturally with the Moisture Doctor toner (before serum) and the Moisture Doctor Cream or rose creams (after serum). You do not need to stay within the isoi brand for the full routine, but the product design is coherent across lines.

A practical matching guide:

• Skin aging, sagging, loss of firmness: Start with Core Elasticity Serum. Step up to Intensive Lifting Serum for stronger visible results.
• Both concerns above, early stage: Core Elasticity Serum daily; Intensive Lifting as an alternating evening treatment.
• Enlarged pores and oily skin: Pore Tightening Control Serum 50ml.
• Active blemishes and breakout-prone skin: Blemish Care Serum 70ml for full-face prevention; Blemish Care Up Serum for spot treatment.
• More intensive blemish treatment: Blemish Care Serum Plus 50ml.
• Multiple concerns (eg. both pores and blemishes): Use the serum targeting your primary concern as the main product; treat the secondary concern in other routine steps (pore-focused cream, SPF, cleansing).

Do not layer two isoi serums targeting completely different mechanisms (eg. Lifting + Blemish Care) unless you have confirmed the formulas do not conflict. Using one targeted serum per routine session and alternating by morning/evening is a more controlled approach.

Serums work on different timelines depending on the mechanism:

• Blemish Care: Active blemishes typically respond within 3 to 5 days of consistent application. Preventive use (no active breakouts) reduces new blemish frequency over 4 to 6 weeks of daily use.
• Pore Tightening: The astringent tightening effect is visible within hours of each application. The longer-term improvement in skin texture and pore appearance builds over 4 to 8 weeks of consistent use.
• Core Elasticity / Intensive Lifting: These are the slowest-acting. Collagen synthesis is a cumulative biological process - meaningful changes in firmness and elasticity require 6 to 12 weeks of daily use. Do not judge results at 2 weeks.

For all serums: consistency matters more than quantity. Using a modest amount twice daily is more effective than using a large amount occasionally. A 35ml serum used properly (2 to 3 drops per application) should last 8 to 10 weeks.