Skip to content

Hyaluronic Acid 100% Pure Serum

Hyaluronic Acid 100% Pure Serum

Product Description

Product overview

Made in Various INTERNATIONAL

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.

Fragrance-Free Paraben-Free Dye-Free Cruelty-Free (Leaping Bunny) Vegan Non-Comedogenic Fungal Acne Safe Pregnancy Safe Made in USA All Skin Types
Pregnancy
Yes
Fungal Acne
Yes
Comedogenic
0/5
Brand
Timeless Skin Care
Sizes
1 oz / 2 oz / 8 oz
Key Active
Sodium Hyaluronate 1%
Ingredients
4 Total
PAO
12 Months
Real reviews · YouTube Shorts
Why it's different

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.

01

Texture & feel

SENSORY
Consistency
Thin Watery Serum
Scent
Fragrance-Free
Absorption
Very Fast (~30 sec)
Finish
Dewy, Non-Greasy

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.

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.

02

Safety & compatibility

SAFE
Pregnancy & Breastfeeding Safe

Contains 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.

Fungal Acne (Malassezia) Safe

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.

Non-Comedogenic · Rating 0/5

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.

Sensitive Skin Compatible

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.

Pairs with Retinol & Vitamin C

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.

Dry Climate Caution

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.

03

Ingredient breakdown

INGREDIENTS

Water (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
Hyaluronic acid is naturally produced by the human body — it is a biocompatible ingredient with an outstanding safety profile across all skin types and life stages.

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
Some individuals with Benzyl Alcohol sensitivity or contact dermatitis may experience mild reactions. Patch test recommended for those with very reactive skin.

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

FREE FROM: Parabens · Fragrance/Perfume · Artificial Dyes & Colorants · Sulfates · Silicones · Mineral Oil · Animal-Derived Ingredients · Phthalates · Formaldehyde-Releasing Preservatives · Retinoids · Hydroquinone · Salicylic Acid · Essential Oils
04

Where it fits in your routine

ROUTINE
1
Cleanser
2
Toner
3
This Serum
4
Treatment Serum
5
Moisturizer
6
Sunscreen (AM)

Apply to damp skin after toner for maximum absorption. Always seal with a moisturizer — especially in dry climates. Use AM & PM daily.

05

How to use

HOW TO USE
1

Cleanse 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.

2

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.

3

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.

4

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.

5

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.

6

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.

06

Who is it for?

WHO

Perfect 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
07

Skin type compatibility

SKIN TYPES
Oily Skin
Excellent

Watery, 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.

Combination Skin
Excellent

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.

Normal Skin
Excellent

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.

Sensitive Skin
Good

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.

Acne-Prone Skin
Excellent

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.

Dry Skin
Moderate

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.

08

Results timeline

MONTH 1+
Day 1 – First Use

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 softness
Days 3–7

Consistent 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 tightness
Week 2

Measurable 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 days
Month 1+

Long-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 repurchase
09

Ratings by platform

18K+ REVIEWS
Amazon (2 oz)
4.3
Rating
14,000+
Reviews
Main complaint: Some dry-skin users report increased tightness when not sealed with a moisturizer; others note the 1 oz bottle runs out quickly with heavy use.
Timeless Official Website
4.7
Rating
500+
Reviews
Main complaint: A minority of users report the watery consistency can feel "too basic" on its own without additional moisturizers.
iHerb / Vitacost
4.4
Rating
800+
Reviews
Main complaint: Customers in dry climates note needing to layer heavily; a few mention slight tackiness in high-humidity conditions.
Walmart
4.2
Rating
3,000+
Reviews
Main complaint: A handful of users with very dry skin feel it doesn't provide enough standalone hydration without a layered moisturizer.
10

Pros & cons

BALANCED

Praised

  • 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
11

Budget-friendly alternatives (dupes)

DUPES
92% Match
Hyaluronic Acid 2% + B5 Serum
$8.90
Budget Pick

Very 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.

75% Match
Hydro Boost Hydrating Serum
$18.00
Similar Range

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.

70% Match
Hyaluronic Acid Hydra Power Essence
$22.00
Similar Range

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.

12

Comparison with competitors

SIDE-BY-SIDE
Hyaluronic Acid 2% + B5 Serum
Key Ingredient HA 2% (Multi-Weight)
Ingredient Count ~20
Fragrance-Free Yes
Fungal Acne Safe Yes
Country of Origin Canada
Multi-Molecular HA Yes
Added Actives Vitamin B5

SkinCeuticals Hyaluronic Acid Intensifier

Key Ingredient HA + Proxylane + Botanicals
Ingredient Count ~25
Fragrance-Free Yes
Fungal Acne Safe No (esters)
Country of Origin USA
Multi-Molecular HA Yes
Added Actives Proxylane, Licorice
Hydro Boost Hydrating Serum
Key Ingredient Hyaluronic Acid
Ingredient Count ~18
Fragrance-Free Contains Fragrance
Fungal Acne Safe No (esters)
Country of Origin USA
Multi-Molecular HA Partial
Added Actives Glycerin
13

Storage & shelf life

12 MONTHS
Period After Opening (PAO)

12 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.

Storage

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.

Packaging

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.

Travel Friendly

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.

13

Frequently asked questions

FAQ

Yes, 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.

— Skincarisma verdict
4.4 / 5 ★★★★☆

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.

Browse related

By Concern Anti-Aging Dryness
By Brand & Origin US Brands

Product Overview

question
lightbulb What are Quick Product Notes?

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.

muscle Pro Tip Alert!

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.

Awesome, I Understand!

Quick Product Notes

Click on icons for more information
question
lightbulb What are Notable Effects & Ingredients?

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.

muscle Pro Tip Alert!

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

Awesome, I Understand!

Notable Effects & Ingredients

wound Promotes Wound Healing from 1 ingredient(s):
Sodium Hyaluronate
question
lightbulb What are Ingredients Related to Skin Type?

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.

muscle Pro Tip Alert!

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!

Awesome, I Understand!

Ingredients Related to Skin Types

Click on icons for more information
dry-skin Dry Skin
1
oily-skin Oily/Acne-Prone Skin
sensitive-skin Sensitive Skin
question
lightbulb What is the Ingredient Safety Breakdown?

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.

muscle Pro Tip Alert!

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.

Awesome, I Understand!

Ingredient Safety Breakdown

EWG Health Ratings
Low risk
Medium risk
High risk
Unknown risk
75% 25%

Product ingredient list

Showing first 5 of 4 ingredients
EWG CIR Ingredient Name & Cosmetic Functions Notes
1 Unknown
Water
Solvent, Skin Conditioning
1 A
Sodium Hyaluronate
Skin Conditioning, Humectant
Promotes Wound Healing
Hydrating
5 A
Benzyl Alcohol
Solvent, Masking, Fragrance, Viscosity Decreasing Agent, Preservative, External Analgesic, Perfuming
1 A
Dehydroacetic Acid
Preservative