HKH serums01 Review
Our verdict
HKH's capsule-format serum squeezes retinol, vitamin C, vitamin E, hyaluronic acid, and collagen into a $13.99 package that is alcohol-free and fragrance-free, delivering a multi-active punch at a budget price. With 576 ratings averaging 4.4 stars and 38 monthly buyers, it has a modest but approving audience.
Check price on AmazonBest for
Budget-conscious buyers who want a multi-active serum touching retinol, vitamin C, and hyaluronic acid in a single fragrance-free, alcohol-free capsule format.
Skip if
You need clinically disclosed concentrations of each active, or you want a single high-potency ingredient rather than a broad ingredient blend at budget pricing.
- Form Capsule
- Skin type All
- Key ingredients Retinol Vitamin C Vitamin E Hyaluronic Acid Collagen
- Targets After Cleansing
- Size 19.55 Cubic Inches
- Scent Unscented
- Priced 36% below the category median ($22.00 across 291 tracked models)
Our scorecard
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Owner rating4.4/5
4.4 average across 576 owner ratings
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Popularity3.0/5
576 owner reviews, more than most models here
The overall score is owner satisfaction weighted by how many reviews back it, so a high rating from few reviews counts for less. The bars below show where this model stands against the other anti-aging skincare: serums, night creams, facial peels, wrinkle patches and anti-aging devices we track in this category on price, popularity and size. Context, not marks against it, and our read of the data, not a lab test.
Overview
['HKH is a lower-profile brand, but the ingredient list on this serum capsule reads like a greatest-hits of anti-aging actives: retinol, vitamin C, vitamin E, hyaluronic acid, and collagen. At $13.99, the price is significantly lower than most serums that claim even half that ingredient roster.', 'The capsule delivery format is designed to protect unstable ingredients like retinol and vitamin C from air and light oxidation, which can be a practical advantage over open-pump bottles. Each capsule holds a single application dose, eliminating guesswork and reducing contamination risk. The formula is biodegradable, fragrance-free, and alcohol-free, which makes it a reasonable option for sensitive skin buyers who want multiple actives without harsh additives.', 'The 576-review pool at 4.4 stars is meaningful for a budget capsule serum. Thirty-eight units bought last month is a modest but real signal of ongoing demand. Buyers willing to accept unknown concentrations in exchange for broad active coverage at a low cost will find this a compelling option.']
Pros
- Five key actives (retinol, vitamin C, vitamin E, hyaluronic acid, collagen) at a $13.99 price
- Capsule format protects actives from oxidation and doses each application precisely
- Alcohol-free and fragrance-free with biodegradable packaging
- Suitable for all skin types and all skin tones
- 4.4-star average from 576 reviews is solid for a budget multi-active
Cons
- No disclosed concentrations, so potency of each active is unknown
- Collagen in a topical serum does not penetrate deep skin layers, limiting its direct anti-aging action
- Brand has limited third-party documentation or clinical backing
- Capsule format means no flexibility to adjust dose mid-application
Specifications
- Form
- Capsule
- Skin type
- All
- Key ingredients
- Retinol Vitamin C Vitamin E Hyaluronic Acid Collagen
- Targets
- After Cleansing
- Size
- 19.55 Cubic Inches
- Scent
- Unscented
- Free of
- Alcohol Free
- Skin tone
- All
- Features
- Biodegradable, Fragrance Free
Performance notes
Retinol is a vitamin A derivative that is one of the most studied actives for targeting the appearance of fine lines and uneven texture with consistent use. Vitamin C supports a brighter skin tone appearance and provides antioxidant coverage. Vitamin E complements vitamin C as a co-antioxidant. Hyaluronic acid adds surface hydration. Collagen as a topical ingredient has limited absorption into the dermis but can contribute to skin feel and surface smoothness. The capsule format genuinely helps protect retinol and vitamin C from degradation, which is a practical formulation advantage. Effectiveness still depends on the concentrations used, which are not disclosed.
What buyers say
576 reviews at 4.4 stars is a positive result for a budget capsule serum from a lesser-known brand. Buyers at this price point are typically forgiving of premium branding gaps if the product performs. The 4.4 average suggests most buyers are seeing acceptable results, though the absence of concentration data makes it difficult to benchmark against established retinol or vitamin C serums.
More from HKH
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Frequently asked questions
Does the capsule format actually make a difference for ingredient stability?
Yes, for actives like retinol and vitamin C, which degrade when exposed to air and light, single-dose capsules are a meaningful protective measure. Each capsule is opened just before use and the entire dose is applied, so the active ingredients are never sitting in an open bottle between uses. This can extend the effective shelf life of the actives compared to pump or dropper formats.
Can retinol in a multi-active formula still be effective?
Retinol can be effective in a combined formula, but concentration matters. Higher-concentration retinol serums (0.5 percent or above) are more likely to produce visible results for fine lines, while very low concentrations may contribute minimally. Without knowing the exact percentage in this formula, buyers are taking some uncertainty on potency. For first-time retinol users, a lower-concentration blend may actually be a gentler starting point.
How does topical collagen work in a serum?
Topical collagen molecules are generally too large to penetrate into the dermis where structural collagen exists. In a serum, collagen functions more as a humectant and skin-feel ingredient, adding a plumping sensation at the surface and helping skin feel smoother. For collagen synthesis deeper in the skin, retinol and vitamin C are the ingredients with stronger research backing.