Hyaluronic Acid 100% Pure Serum
Hyaluronic Acid 100% Pure Serum
Product Description
Product overview
The original best-selling hydration serum from Timeless Skin Care — a pure, minimalist formula containing 1% Sodium Hyaluronate in a water base, preserved cleanly without parabens, fragrance, or dyes. Crafted in small batches in the USA, this serum draws moisture into the skin like a sponge, delivering visible plumpness and relief from tightness in just days of use.
1000x Moisture Capacity
Sodium Hyaluronate can hold up to 1,000 times its weight in water, acting as a powerful humectant that draws moisture from the environment into the skin's surface layers.
Texture & feel
SENSORY1000x Moisture Capacity
Sodium Hyaluronate can hold up to 1,000 times its weight in water, acting as a powerful humectant that draws moisture from the environment into the skin's surface layers.
1% Clinical-Grade Concentration
Formulated at 1% Sodium Hyaluronate — double the amount used in many competing serums — for maximum hydrating efficacy without added fillers or unnecessary ingredients.
Ultra-Clean 4-Ingredient Formula
Only four ingredients total. No parabens, no fragrance, no dyes, no sulfates, no animal ingredients. Ideal for reactive and sensitive skin types seeking the purest hydration possible.
Small-Batch USA Manufacturing
Produced in small batches at Timeless Skin Care's own facility in Houston, Texas, with complete quality control from formulation through to filling — no third-party manufacturing.
Boosts Other Actives
HA creates a hydrated, permeable base layer that enhances absorption of subsequent serums — ideal when layered under Vitamin C, retinol, niacinamide, or peptide products.
Unbeatable Value
One of the most affordable 1% hyaluronic acid serums on the market. Available in multiple sizes including an 8 oz refill bottle for exceptional cost-per-use savings.
Safety & compatibility
SAFEContains no retinoids, salicylic acid, hydroquinone, or chemical sunscreen filters. Hyaluronic acid and the preservative system (Benzyl Alcohol, Dehydroacetic Acid) are considered safe during pregnancy. Always consult your doctor or midwife for personal guidance.
The formula is completely free of fermented ingredients, fatty acid esters, oils, and polysorbates that are known to feed Malassezia yeast. All four ingredients are confirmed fungal acne safe.
None of the ingredients in this serum have any comedogenic potential. Sodium Hyaluronate is rated 0/5 on the comedogenic scale and is universally well-tolerated, even by acne-prone skin.
Fragrance-free, dye-free, and alcohol-free formula. The preservative system is gentle and at low concentrations. WIMJ rates this serum as low irritation potential overall.
Hyaluronic acid is fully compatible with all major actives including retinol, Vitamin C, AHAs, BHAs, and niacinamide. It can be layered under or mixed with these ingredients without any risk of interaction.
In very low-humidity environments, hyaluronic acid can draw moisture from deeper skin layers if not sealed with a moisturizer or occlusive. Always layer a cream or oil on top for best results, especially in dry or cold climates.
Ingredient breakdown
INGREDIENTSWater (Aqua) ~93–95%Base
The primary vehicle and solvent for this serum. Purified water provides the lightweight, fluid texture and acts as the delivery medium for Sodium Hyaluronate, enabling its deep penetration into the stratum corneum.
- Function: Solvent, carrier, hydration base
- Skin Benefit: Provides initial surface hydration and supports humectant activity
- Safety: Universally safe; rated 1/10 on EWG Skin Deep (no concern)
Sodium Hyaluronate 1%Proven
The star active ingredient and the reason this serum exists. Sodium Hyaluronate is the sodium salt form of Hyaluronic Acid — smaller in molecular size than HA itself, which allows it to penetrate more effectively into the upper layers of the skin. At 1% concentration, this serum delivers double the humectant activity of many competitor formulas. It can hold up to 1,000 times its weight in water, instantly plumping fine lines and creating a dewy, supple complexion.
- Mechanism: Binds and retains water molecules in the epidermis and upper dermis via hygroscopic action
- Clinical Data: Based on a 14-day third-party study with 24 participants (ages 20–58), users showed measurable improvement in skin moisture content and reduction in tightness
- Molecular Weight: High molecular weight (stays on surface for barrier support) and mid-range molecular weight fractions present
- WIMJ Analysis: Rated 6.10%–9.20% effective concentration range based on formula position and solvent volume
Benzyl Alcohol <1%Preservative
An aromatic alcohol used as a preservative to prevent microbial and bacterial contamination of the water-based formula. At the low concentration used here, it acts purely as a preservative rather than a skin-drying alcohol. It is FDA-approved and widely accepted as safe when used within regulated limits in cosmetic formulations.
- Function: Broad-spectrum preservative; prevents bacterial and fungal growth
- Regulatory Status: FDA GRAS (Generally Recognized As Safe) at cosmetic-use concentrations
- Note: Different from drying short-chain alcohols (ethanol, SD alcohol) — does not strip the skin barrier at preservative-level concentrations
Dehydroacetic Acid <0.6%Preservative
A synthetic preservative commonly paired with Benzyl Alcohol to create a broad-spectrum, paraben-free preservation system. It provides antifungal and antibacterial protection at very low concentrations, keeping the serum stable and safe throughout its shelf life. It is well-tolerated by most skin types and approved by the EU Cosmetics Regulation and the FDA.
- Function: Antifungal and antibacterial preservative; works synergistically with Benzyl Alcohol
- Concentration: Used well below the EU maximum of 0.6% in cosmetics
- Safety: EWG Score 3/10 (mild concern at high doses; low concern at cosmetic-use levels)
4 ingredients
Water, Sodium Hyaluronate, Benzyl Alcohol, Dehydroacetic Acid
Where it fits in your routine
ROUTINEApply to damp skin after toner for maximum absorption. Always seal with a moisturizer — especially in dry climates. Use AM & PM daily.
How to use
HOW TO USECleanse Thoroughly
Start with a gentle cleanser to remove makeup, sunscreen, and impurities. Pat skin dry but leave it slightly damp — damp skin enhances hyaluronic acid absorption significantly.
Apply Toner (Optional)
If you use a hydrating or pH-adjusting toner, apply it first and allow it to absorb for 20–30 seconds before moving on to the serum.
Dispense 2–3 Pumps (or Drops)
Pump or drop 2–3 doses into your palm or fingertips. This is sufficient to cover the entire face and neck. Avoid over-applying — a little goes a long way with this lightweight formula.
Press & Pat into Skin
Smooth and gently press the serum onto your face and neck using upward motions. Allow 20–30 seconds for full absorption. You should feel a light, non-sticky finish.
Layer & Seal
Immediately follow with your moisturizer, facial oil, or occlusive to lock in the moisture drawn in by hyaluronic acid. For AM routines, finish with SPF 30 or higher.
Use AM & PM Daily
This serum is gentle enough for twice-daily use every morning and night. Consistent use builds cumulative hydration improvement over days and weeks.
Who is it for?
WHOPerfect for you if:
- You have oily, combination, normal, or sensitive skin looking for lightweight daily hydration
- You want a no-fuss, minimal-ingredient serum free of fragrance and irritants
- You're pregnant or breastfeeding and need a pregnancy-safe hydrator
- You have fungal acne (malassezia folliculitis) and need a Malassezia-safe option
- You want to layer under Vitamin C, retinol, or AHA/BHA actives
- You're on a budget and want clinical-grade hyaluronic acid at an affordable price
- You live in a humid climate where humectants work most effectively
Consider alternatives if:
- You have severely dry skin and need a richer, more occlusive formula with ceramides or oils
- You live in a very dry or desert climate and don't use a moisturizer on top
- You're looking for anti-aging actives like retinol, peptides, or Vitamin C in a single serum
- You prefer multi-molecular weight HA formulas (this uses a single grade of Sodium Hyaluronate)
- You want a product with more complex benefits like brightening, firming, or exfoliation
Skin type compatibility
SKIN TYPESWatery, ultra-lightweight texture absorbs instantly with zero greasiness or heaviness. Provides hydration without increasing oil production — ideal for oil-prone skin that needs moisture without shine.
Works beautifully across different face zones. Hydrates dry cheeks and tight areas without over-loading the T-zone. One of the most universally compatible serums for combination skin types.
Maintains healthy hydration levels and supports skin barrier function. An ideal daily maintenance serum to keep normal skin plump, radiant, and resilient against environmental stressors.
Fragrance-free, dye-free and low-irritation formula. Suitable for most sensitive skin types. Those with Benzyl Alcohol sensitivity should patch test first, as rare reactions have been reported.
Non-comedogenic (0/5), fungal acne safe, and free of pore-clogging oils or esters. Hydrates without triggering breakouts — commonly recommended for blemish-prone skin that is dehydrated by acne treatments.
Works best when sealed with a rich moisturizer or facial oil on top. On its own, this serum may not be sufficient hydration for very dry or dehydrated skin — especially in low-humidity environments.
Results timeline
MONTH 1+Instant Surface Plumpness
Skin feels visibly more supple and hydrated within minutes of application. Surface tightness and dryness are relieved almost immediately as Sodium Hyaluronate draws moisture into the stratum corneum.
90%+ noticed immediate softnessConsistent Hydration & Reduced Tightness
With regular twice-daily use, the cumulative effect builds. Skin stays hydrated for longer throughout the day, fine surface lines from dehydration become less visible, and makeup application improves.
~78% report reduced skin tightnessMeasurable Moisture Improvement
In Timeless's own 14-day third-party clinical study (24 participants, ages 20–58), measurable improvement in skin moisture content was recorded. Skin appears plumper, more even in texture, and healthier overall.
Clinically measurable after 14 daysLong-Term Barrier Support
Consistent use maintains skin hydration homeostasis and strengthens the skin's moisture barrier. When combined with a moisturizer, long-term users report ongoing improvements in skin plumpness, elasticity, and reduced fine lines.
~85% of long-term users repurchaseRatings by platform
18K+ REVIEWSPros & cons
BALANCEDPraised
- Extremely affordable for a 1% clinical-grade HA serum
- Only 4 ingredients — remarkably clean and transparent formula
- Fast-absorbing, non-greasy, leaves no residue
- Fragrance-free, paraben-free, vegan, cruelty-free
- Fungal acne safe and pregnancy safe
- Works beautifully under makeup and layered with actives
- Available in multiple sizes including a cost-saving 8 oz refill
- Produced in USA with in-house quality control
- Delivers instant visible plumpness and softness
- Compatible with all skin types including acne-prone skin
Criticized
- Not sufficient as a standalone moisturizer — must be sealed with a cream
- Can cause increased dryness in low-humidity climates if used without occlusive
- Contains only a single grade of HA (no multi-molecular weight complex)
- No additional anti-aging actives like peptides, Vitamin C, or retinol
- 1 oz bottle lasts approximately 1 month — small for the price point
- Benzyl Alcohol may cause sensitivity in rare cases of contact dermatitis
- Polarized Amazon reviews: some dry-skin users report unexpected tightness
Budget-friendly alternatives (dupes)
DUPESVery similar concept — a simple hydrating serum with Sodium Hyaluronate. The Ordinary's version uses 2% HA but at multiple molecular weights (low, medium, high) plus Vitamin B5 for added skin-restoring benefit. Slightly more complex formula, but same minimalist philosophy and comparable price.
Uses Hyaluronic Acid as the hero ingredient in a lightweight gel texture. More widely available in drugstores. Contains a few more ingredients including glycerin for additional humectancy, but also includes fragrance. Less clean than the Timeless formula.
K-beauty alternative with Sodium Hyaluronate as a primary active in an essence format. Contains additional botanicals and humectants. More luxurious texture with added skin-calming ingredients. Slightly pricier for a similar core hydrating benefit. Fragrance-free and clean.
Comparison with competitors
SIDE-BY-SIDETimeless HA 100% Pure
SkinCeuticals Hyaluronic Acid Intensifier
Storage & shelf life
12 MONTHS12 months after opening (as indicated by the PAO symbol on the packaging). The product is effective for 24 months from the date of manufacture when unopened.
Store in a cool, dry place away from direct sunlight and heat. Timeless recommends refrigeration to extend shelf life and enhance the refreshing, cooling sensation on application.
Glass bottle with pump dispenser (1 oz and 2 oz sizes) or dropper cap. The glass construction protects formula integrity. The 8 oz size comes in a larger bottle ideal as a refill or salon use.
Yes — the 1 oz (30 ml) bottle is TSA-compliant and under the 100 ml airline liquid limit, making it ideal for carry-on travel. The 2 oz bottle exceeds TSA limits and must be checked.
Frequently asked questions
FAQYes, this serum is considered safe for use during pregnancy and breastfeeding. The formula contains only four ingredients: Water, Sodium Hyaluronate (hyaluronic acid), Benzyl Alcohol, and Dehydroacetic Acid. None of these are on the list of ingredients to avoid during pregnancy, which typically includes retinoids, salicylic acid at high concentrations, hydroquinone, and certain chemical sunscreen filters. Hyaluronic acid is a naturally occurring substance in the body and is widely recommended as safe. As always, consult your healthcare provider or obstetrician before introducing any new skincare product during pregnancy.
Yes, this serum is 100% safe for fungal acne (malassezia folliculitis). The four-ingredient formula contains no fermented ingredients, no fatty acids, no esters, no oils, and no polysorbates — the common triggers for malassezia-related breakouts. Sodium Hyaluronate is a sugar-based humectant that does not feed Malassezia yeast. This makes it one of the cleanest and safest hydrating serums available for those managing fungal acne or malassezia-sensitive skin conditions.
Absolutely — hyaluronic acid is one of the most universally compatible skincare ingredients and pairs beautifully with all major actives. You can layer it under Vitamin C (apply HA first to damp skin, then Vitamin C on top), retinol (apply HA first as a buffer to reduce potential irritation), AHA/BHA acids (apply acids first, wait a few minutes, then apply HA), and niacinamide or peptides. Timeless themselves recommend layering this serum under their own Vitamin C + E Ferulic Acid Serum for enhanced absorption and hydration benefits. There are no known negative interactions between Sodium Hyaluronate and any other skincare ingredient.
This serum is recommended for all skin types, though it performs best on oily, combination, normal, and acne-prone skin. Its ultra-lightweight, water-based texture makes it ideal for those who don't want a heavy or greasy layer in their routine. For dry or very dehydrated skin, it works well but must be immediately sealed with a moisturizer or facial oil — in very dry climates, hyaluronic acid can draw moisture from deeper skin layers if not occluded. It is particularly excellent for fungal acne, sensitive skin, and anyone seeking a minimalist, clean-label hydrating serum.
Results begin immediately — most users notice visible skin plumpness and relief from surface tightness within minutes of the very first application. Surface dehydration lines soften noticeably from day one. With consistent twice-daily use, cumulative hydration improvement builds over the first 1–2 weeks. In Timeless's own 14-day clinical study with 24 participants, measurable improvement in skin moisture levels was recorded after 14 days. Long-term users (1–3 months) report sustained plumpness, improved skin texture, and better makeup application as consistent benefits.
Apply this serum as the 3rd step in your routine — after cleansing and toning, but before any treatment serums (Vitamin C, retinol, etc.) and before your moisturizer. The key rule: apply to slightly damp skin after your toner, as hyaluronic acid requires moisture to draw from. Then layer your treatment serums on top, followed by moisturizer to seal everything in. For AM routines, finish with SPF 30 or higher. Use morning and night for best results. It can also be mixed directly into your moisturizer for a combined hydration boost.
No — this serum is non-comedogenic with a comedogenic rating of 0/5. Sodium Hyaluronate is a water-soluble sugar molecule with zero pore-clogging potential. The formula contains no oils, waxes, silicones, or occlusive ingredients that could block pores. It is widely used and trusted by acne-prone individuals, dermatologists, and estheticians for its clean, pore-safe profile. Multiple long-term user reviews confirm no breakouts or pore-clogging effects even with daily twice-daily use over months and years.
The recommended period after opening (PAO) is 12 months, as indicated by the PAO symbol on the packaging. However, when stored properly (cool, dry place; refrigeration recommended by Timeless), the formula may remain effective for longer. In terms of quantity, the 1 oz (30 ml) bottle lasts approximately 1 month with twice-daily use of the recommended 2–3 drops. The 2 oz bottle lasts approximately 2 months, and the 8 oz bottle is ideal for long-term use or families. Refrigeration is suggested to help preserve freshness and potency beyond opening.
Verdict: The Timeless Skin Care Hyaluronic Acid 100% Pure Serum is a benchmark-setting product in the affordable skincare space. Its four-ingredient formula — built around a clinical 1% Sodium Hyaluronate concentration — delivers exactly what it promises: immediate, visible skin hydration with zero fillers, no fragrance, and no unnecessary complexity. It is pregnancy safe, fungal acne safe, non-comedogenic, and universally compatible with all actives and skin types. The main caveat is that it functions as a hydrator, not a standalone moisturizer — dry-skin users must layer it beneath a cream or oil, and those in arid climates need to be diligent about sealing it in. For the price point and formula purity, it remains one of the best-value hyaluronic acid serums available anywhere. An easy recommendation for anyone building a clean, effective, affordable routine.
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Product Overview
Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.
Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.
Quick Product Notes
Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging «promises» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.
We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.
Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.
Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you
Notable Effects & Ingredients
Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.
We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.
A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.
One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!
Ingredients Related to Skin Types
Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.
EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.
Ingredient Safety Breakdown
Product ingredient list
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
| 1 |
Water
Solvent, Skin Conditioning
|
|
|
| 1 |
Sodium Hyaluronate
Skin Conditioning, Humectant
|
Promotes Wound Healing
Hydrating
|
|
| 5 |
Benzyl Alcohol
Solvent, Masking, Fragrance, Viscosity Decreasing Agent, Preservative, External Analgesic, Perfuming
|
|
|
| 1 |
Dehydroacetic Acid
Preservative
|
|




