Hyaluronic Acid: Effect, Truth & Risks – What Creams, Capsules and Fillers Really Do

Hyaluronic acid is a substance the body produces itself, with a high capacity to bind water, and it can visibly hydrate the skin. Because of its large molecular size it barely penetrates into deeper skin layers from a cream and works mainly on the surface. Taken orally it is broken down in the gut and shows only moderate effects. Injections, by contrast, work directly and effectively, but carry risks. The actual effect of hyaluron is often overestimated and misunderstood.

Janine Griesser

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What is hyaluronic acid?

Hyaluronic acid is a natural component of our body and is found above all in:

skin
joints
connective tissue

Its most important property:

👉 extreme water binding

Hyaluron can:

👉 bind up to 1000 times its own weight in water

That explains why the skin:

looks plumper
appears smoother
gains more „glow“

The decisive point: molecular size

A central and often misunderstood factor is the size of the molecule.

In dermatology the rule is:

👉 the skin only lets through molecules below roughly 500 Dalton

This is known as the 500 Dalton rule.

For comparison:

Water: ~18 Dalton → penetrates
Vitamin C: ~176 Dalton → can penetrate
Hyaluronic acid:

👉 50,000 to several million Dalton

👉 Hyaluronic acid is up to 10,000 times too large

to penetrate deep into the skin.

So does hyaluron in creams work at all?

Yes – but differently than many people think.

Hyaluronic acid:

stays on the skin surface
attracts water
holds moisture
smooths optically

👉 The result:

less visible wrinkles
smoother skin in the short term
a fresher appearance

An important distinction

👉 Hyaluron does not change the skin structure

👉 but its moisture level

Or more simply:

👉 It is an optical effect – not anti-aging at depth

High- vs. low-molecular hyaluronic acid

Not all hyaluronic acid is the same.

High molecular weight

stays on the surface
hydrates immediately

Low molecular weight

smaller
can penetrate somewhat deeper
possibly longer-lasting effects

But:

👉 low-molecular forms are no miracle solution either

Taking hyaluron orally – what really happens?

Oral hyaluronic acid is:

👉 broken down in the gut

That means:

👉 it does not reach the skin as finished hyaluron

What do the studies say?

Studies show:

👉 slight improvements in:

skin moisture
elasticity

👉 usually after 6–12 weeks

But:

the effects are moderate
strongly dependent on the product
not comparable to the advertising

👉 Your body decides for itself

👉 what happens to the building blocks

Hyaluron injections (fillers)

This is where the biggest difference lies:

👉 hyaluron is injected directly into the skin

That leads to:

immediate volume
visible wrinkle reduction
structural change

👉 This is the only form that really works at depth

Risks of hyaluron fillers

Most side effects are mild:

swelling
bruising
asymmetries

But:

👉 rarely, serious complications can occur

If hyaluron enters a blood vessel:

👉 it can block it

Possible consequences:

tissue damage
skin necrosis
in extreme cases: blindness

👉 rare – but medically relevant

Why do many people have their hyaluron dissolved again?

A growing trend:

👉 people are having fillers removed again

Reasons:

unnatural results
„overfilling“
changing beauty trends
migration (shifting within the tissue)

👉 Many report:

„I do not recognize myself any more.“

Common misconceptions

❌ „Hyaluron builds collagen“

👉 only minimally and indirectly

❌ „The more hyaluron, the better“

👉 can even be counterproductive

❌ „Expensive products work better“

👉 often marketing, not active ingredient

What does this mean for you?

👉 Hyaluron is worthwhile – but:

as a moisturizer
for short-term skin improvement

👉 not as an anti-aging miracle

Conclusion

Hyaluronic acid is an effective ingredient –

but its effect is frequently misunderstood.

👉 Creams: a surface effect

👉 oral: small effects

👉 injection: strong, but with risk

Or in short:

👉 Hyaluron is not a miracle cure

👉 it is a tool

Sources

Bos JD, Meinardi MM. The 500 Dalton rule for the skin penetration of chemical compounds and drugs. Exp Dermatol. 2000. https://pubmed.ncbi.nlm.nih.gov/10839713/

Sundaram H, et al. Benefits of topical hyaluronic acid for skin quality and signs of skin aging. https://pubmed.ncbi.nlm.nih.gov/36200921/

Oral administration of hyaluronic acid to improve skin conditions… https://pmc.ncbi.nlm.nih.gov/articles/PMC10661223/

Efficacy in Skin Hydration, Elasticity, and Wrinkle Depth Reduction. https://pubmed.ncbi.nlm.nih.gov/40911749/

Oral hyaluronan relieves wrinkles and improves dry skin. https://pubmed.ncbi.nlm.nih.gov/34203487/

Oral hyaluronan relieves wrinkles: a double-blinded, placebo-controlled study. https://pubmed.ncbi.nlm.nih.gov/28761365/

Ingestion of an Oral Hyaluronan Solution Improves Skin Hydration and Elasticity. https://pubmed.ncbi.nlm.nih.gov/29228816/

Oral sodium hyaluronate improves skin hydration, barrier function… https://pubmed.ncbi.nlm.nih.gov/41422283/

Hyaluronic acid filler-induced vascular occlusion – three case reports… https://pubmed.ncbi.nlm.nih.gov/38131127/

Disclaimer

This article is intended as evidence-based health education and does not replace individual medical advice.

This is where the biggest difference lies:

👉 hyaluron is injected directly into the skin

That leads to:

immediate volume
visible wrinkle reduction
structural change

👉 This is the only form that really works at depth

Risks of hyaluron fillers

Most side effects are mild:

swelling
bruising
asymmetries

But:

👉 rarely, serious complications can occur

If hyaluron enters a blood vessel:

👉 it can block it

Possible consequences:

tissue damage
skin necrosis
in extreme cases: blindness

👉 rare – but medically relevant

Why do many people have their hyaluron dissolved again?

A growing trend:

👉 people are having fillers removed again

Reasons:

unnatural results
„overfilling“
changing beauty trends
migration (shifting within the tissue)

👉 Many report:

„I do not recognize myself any more.“