isoi Essences
ISOI's essence collection is one of the broadest in the K-beauty range on skinsli - 34+ products covering tonic essences, pore-tightening essences, intensive treatment essences, and Bulgarian rose variants. The tonic essence format bridges toner and serum in a single step, making it practical for simplified routines. The Bulgarian Rose line uses standardised Damascus rose extract at a high concentration, while the Recovery and Pore Tightening lines address specific skin concerns. Sizes run from 50ml intensive formulas up to 260ml daily-use bottles.
By Skinsli editorial Updated
Buying guide
ISOI Essences: Tonic, Bulgarian Rose, Pore Tightening & Treatment Formulas
In K-beauty, essences occupy the step between toner and serum - they deliver concentrated actives in a lighter, faster-absorbing format than a serum, and they condition the skin to receive subsequent products more effectively. ISOI's essence range is unusually deep for a single brand: 34+ products covering moisture, pore refinement, Bulgarian rose benefits, and recovery. This guide maps the full collection so you can find the right product for your routine and skin concern.
Tonic Essence: The Hybrid Between Toner and Serum
The 'Tonic Essence' naming ISOI uses throughout the range refers to a specific product type: a formula that functions as both a toner (balancing and preparing the skin) and an essence (delivering concentrated actives). It is applied after cleansing and before heavier serums or creams.
The tonic essence format has practical advantages over using a separate toner and essence:
- Fewer steps without sacrificing function
- Consistent layering - one product handles pH preparation and active delivery simultaneously
- The 130ml bottle size at the most common price point makes it economical for daily use
ISOI's tonic essences are designed to be swiped across the face using a cotton pad or gently pressed in using hands - the latter ('7 skin method' in Korean beauty) is often preferred for maximum absorption.
Bulgarian Rose Essences: Three Levels of Concentration
The Bulgarian Rose sub-line has the most variants in the essence range. Products in stock:
- Bulgarian Rose Moisture Tonic Essence 130ml - the daily-use entry point for rose essences. Hydration-focused with the rose antioxidant and anti-inflammatory benefit as a background function. Good for all skin types that want rose benefits without a heavy formula.
- Bulgarian Rose Intensive Treatment Essence 130ml - a more concentrated treatment positioned for skin that shows signs of dullness, early ageing, or stress. 'Intensive' here means a higher rose extract concentration than the standard Tonic Essence.
- Bulgarian Rose Intensive Multiple Essence 50ml - the highest-concentration rose essence in the range. The 50ml size reflects its use as a targeted treatment in smaller amounts rather than a full-face sweep. Use this when the skin has a specific concern (brightness, anti-aging) rather than general daily maintenance.
- Bulgarianrose Pore Tightening Tonic Essence 130ml and 260ml - combines rose extract with pore-tightening action. The 260ml size is a value format for daily users who have committed to this product as a routine staple.
Pore Tightening Essences: Managing Enlarged Pores with Daily Use
ISOI offers several pore-focused essences, ranging from base formulas to the rose-infused variants above:
- Pore Tightening Tonic Essence 130ml - the standard pore formula without rose. Uses astringent and pore-minimising actives (typically niacinamide, plant extracts, or zinc-based compounds) to reduce the visible size of pores over time. The 130ml size is large enough for daily use lasting two to three months.
- Pore Tightening Tonic Essence (Old) 130ml - a previous formula version kept in stock. The active ingredient profile may differ slightly; if you found the original formula worked better for your skin, this is available while stock lasts.
Pore-tightening essences work gradually - consistent daily use for 4-6 weeks is where results become visible. They are not one-time treatments. Applied after cleansing, they help control sebum production that contributes to visible pore enlargement over the day.
Moisture Tonic Essence: The Foundational Hydration Step
The ISOI Moisture Tonic Essence 130ml is the most versatile product in the range - hydration-focused without a strong secondary active, making it suitable across skin types and as a base in almost any routine.
It works best as the daily workhorse: used morning and evening after cleansing to restore the moisture that washing removes. The 130ml size is practical for twice-daily use for 2-3 months.
The Moisture Tonic Essence is a logical starting point for anyone new to ISOI essences - lower risk, broad compatibility, and the tonic-essence format means it replaces both a separate toner and a basic essence step in one bottle.
Recovery First Essence Lotion and Fresh Essence Lotion
Two essence-lotion hybrids complete the range:
- Recovery First Essence Lotion 90ml - positioned for skin recovery post-irritation, sun exposure, or active treatment phases (post-retinol, post-AHA). The 'lotion' texture is slightly thicker than a standard essence, giving it more barrier-support capacity. Use when skin is stressed or barrier-compromised as a gentler alternative to an active treatment essence.
- Fresh Essence Lotion (70ml, escape sebum) - a sebum-control lotion-essence hybrid. 'Fresh' signals a lighter, more mattifying texture suited to oily skin that wants essence benefits without added richness. At 70ml it is a smaller daily-use size, likely positioned for sebum-prone skin that benefits from a lighter touch.
These lotion-essence formats sit between an essence and a light moisturiser in texture - they can sometimes replace the moisturiser step for oily skin in warmer months.
How to Apply ISOI Essences for Best Results
Application method affects how much essence you absorb - and with concentrated formulas like ISOI's Treatment Essence, technique matters:
Cotton pad method: Pour 2-3 drops onto a cotton pad and swipe gently across the face. Efficient and hygienic. Best for pore-control and oily-skin products where you do not want to press extra product into congested pores.
Hand-press method (7 skin method): Pour a small amount into the palm, then press hands firmly against different sections of the face until absorbed. Repeat 3-7 times for the 7-skin method, which layers the essence for intensive hydration. Best for the Moisture Tonic Essence and Bulgarian Rose variants where absorption depth matters.
For intensive and multiple essences: Use less product - 2-3 drops is sufficient. These are higher concentration and more product does not improve results; it just wastes the formula.
Always apply essence to clean, slightly damp skin (not dripping wet) for the best absorption rate.
Choosing the Right Bottle Size
ISOI essences come in three main sizes, each with a different use case:
- 50ml: The Multiple Essence 50ml is a concentrated treatment used in drops. A 50ml bottle at 2-3 drops per use lasts 3-6 months. Do not compare cost to 130ml bottles directly - the concentration is different.
- 90-130ml: The standard daily-use size. At 5ml per use, morning and evening, 130ml lasts roughly 13 days per ml of product - about 2-3 months.
- 260ml: The Bulgarian Rose Pore Tightening Tonic Essence in 260ml is the most economical option for a product you are already committed to. It roughly doubles the 130ml value and is worth considering once you have confirmed a product works for your skin.
Where ISOI Essences Fit in a K-Beauty Routine
In a standard K-beauty routine structure, essences sit in the middle:
- Cleanser
- Toner (optional if using a Tonic Essence)
- ISOI Tonic Essence or Treatment Essence
- Serum or ampoule (if using one)
- Eye cream
- Moisturiser
- SPF (morning only)
If you use a dedicated ISOI Tonic Essence, you can skip a separate toner - it covers both functions. If you use the Intensive Treatment Essence, keep a lightweight toner before it for better absorption.
The Recovery First Essence Lotion can be the last step in a minimal evening routine, replacing both essence and moisturiser for skin that needs barrier support rather than heavy layering.
FAQ
Frequently asked questions
FAQ
Frequently asked questions
Can I replace my toner with an ISOI Tonic Essence?
Yes. The tonic essence format combines toner and essence functions - it balances and prepares the skin while delivering active ingredients. You do not need a separate toner if you use a tonic essence. If you currently use a toner followed by a serum, replacing both with a tonic essence simplifies your routine without losing effectiveness for most skin types.
Which Bulgarian Rose essence should I start with if I am new to ISOI?
The Bulgarian Rose Moisture Tonic Essence 130ml is the most accessible entry point. It is the daily-use format with a balanced concentration of rose extract and straightforward hydration focus. Once you have confirmed it suits your skin, the Intensive Treatment Essence or Multiple Essence 50ml are the next steps if you want a higher concentration for specific concerns.
How long does it take to see results from the ISOI Pore Tightening Essence?
Most users see noticeable improvement in pore appearance after 4-6 weeks of consistent daily use. Pores do not change quickly - they respond to sustained reduction in sebum buildup and improved skin hydration over time. Using the essence twice daily after cleansing is more effective than occasional use.
How much of the Bulgarian Rose Intensive Multiple Essence should I use per application?
Two to three drops is sufficient for the whole face. The Multiple Essence is a high-concentration formula, and more product does not improve results - it just depletes the bottle faster. At 2-3 drops per use, the 50ml bottle lasts 3-6 months depending on frequency of application.
Is the Recovery First Essence Lotion safe to use immediately after retinol or AHA?
It is designed for recovery phases, which makes it appropriate after active-use nights. Apply it the morning after a retinol or AHA evening routine as a calming, barrier-supportive step before your moisturiser. It is not meant to be layered on top of actives in the same routine - use it the next morning, or on evenings when you are giving actives a rest.
How many ISOI essence products are in stock on skinsli?
There are 34+ ISOI essence products currently in stock, spanning Moisture Tonic Essences, Bulgarian Rose variants (130ml, 50ml, 260ml), Pore Tightening Essences, Intensive Treatment Essences, Recovery Essence Lotion, and Fresh Essence Lotion.
Is it better to apply ISOI essence with a cotton pad or my hands?
Both methods work. Cotton pad application is more hygienic and good for oily skin where you want controlled dosing. Hand-press application absorbs more product into the skin, which matters most for moisture-focused essences. For the Pore Tightening and sebum-control formulas, a pad gives better coverage over congested areas. For the Moisture and Bulgarian Rose essences, hand pressing is often preferred.
What is the difference between the Pore Tightening Tonic Essence and the Pore Tightening Tonic Essence (Old)?
The (Old) label indicates an earlier formula version. ISOI occasionally updates formulations and the previous version may have a slightly different ingredient profile. Some users prefer the original when a reformulation changed how a product performed for their specific skin. Both are 130ml and serve the same pore-tightening function - the (Old) variant is available while remaining stock lasts.
Is the 260ml Bulgarian Rose Pore Tightening Essence good value compared to the 130ml?
Yes, assuming you have already confirmed the product works for your skin. The 260ml format is roughly double the volume and typically more economical per ml. It is worth buying only once you have used the 130ml and know you will continue using it daily - if it turns out not to suit your skin, a large bottle becomes wasteful.
Which ISOI essence is most suitable for sensitive or reactive skin?
The Recovery First Essence Lotion is the most gentle, designed specifically for post-irritation recovery phases. The Bulgarian Rose Moisture Tonic Essence is also well-tolerated by sensitive skin. Avoid starting with the Pore Tightening variants if your skin is sensitive to astringent ingredients. Patch testing before applying any new essence to the full face is always a good approach for reactive skin types.