Ingredient review

Tea Hydroiodide

INCI: TEA-HYDROIODIDE

Tea Hydroiodide is a synthetic preservative booster with limited safety data; it's rarely used in modern skincare and may cause irritation in sensitive individuals.

beautyskincarepreservative

In plain English

Tea Hydroiodide is a man-made ingredient added to some cosmetics to help preserve the product and keep it stable. It's not a common ingredient in most everyday skincare, and there isn't a lot of research on how it affects skin long-term. Because it's a salt form of iodine, it could potentially irritate sensitive skin or cause reactions in people with iodine sensitivities.

Review score

Safety, usefulness, and evidence

2.5Fair
2.5/ 5

Higher-caution ingredient

The evidence base is still emerging, so marketing claims deserve extra caution.

Main practical flags: irritation is moderate; clogging risk is low.

Source
synthetic
Evidence
emerging
Irritation
moderate
Clogging risk
low
How reviews are scored

Quick decision guide

Read the cautions before using

Tea Hydroiodide can be useful, but watch for some irritation potential.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Tea Hydroiodide.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

moderate

Can bother some users, especially with frequent use, damaged skin, or strong companion ingredients.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

emerging

The ingredient may be promising, but claims should be treated more cautiously.

What it is

Tea Hydroiodide is the triethanolamine salt of hydroiodic acid, used as a preservative booster and stabilizer in cosmetic formulations.

How it works

It works by releasing small amounts of iodine, which can help inhibit the growth of microbes, thereby extending the shelf life of the product. It also helps maintain the pH and stability of the formula.

Pros

Preservation support

Helps keep the product free from microbial contamination, extending its usable life.

Stability aid

Can help maintain the formula's pH and overall stability, ensuring consistent performance.

Cons and cautions

Limited safety research

There is very little published research on the long-term safety of Tea Hydroiodide on skin, making it a less trusted choice.

Irritation potential

May cause redness, stinging, or irritation, especially for those with sensitive skin or iodine sensitivity.

Best for

  • People using products that require strong preservation
  • Those without known iodine sensitivity

Use caution if

  • Individuals with iodine allergies or sensitivities
  • Those with very sensitive or reactive skin

Usage tips

Patch test any product containing Tea Hydroiodide before full-face application.
If you have a known iodine allergy, avoid products with this ingredient.

Safety summary

Tea Hydroiodide is considered safe for use in cosmetics at low concentrations, but the lack of robust safety data and potential for irritation means it is not a preferred preservative for sensitive skin.

Research notes

There is minimal peer-reviewed research on Tea Hydroiodide specifically in cosmetics. Most safety information is extrapolated from general iodine chemistry and preservative guidelines.

Common label clues

Typical concentration
Very low, typically under 1%
Regulatory status
Allowed in cosmetics in the US and EU, but with restrictions on concentration due to potential irritation. Not widely reviewed by major safety panels.
Common uses
Preserved formulations, Stabilized products
Environmental note
Synthetic preservatives like this can be persistent in the environment; however, specific data on Tea Hydroiodide is lacking.

Good to know

  • Tea Hydroiodide is not a common ingredient in modern skincare; it's more often found in older formulations or industrial products.
  • The 'TEA' in the name stands for triethanolamine, not tea extract.

Common questions

What is Tea Hydroiodide in beauty products?

Tea Hydroiodide is a man-made ingredient added to some cosmetics to help preserve the product and keep it stable. It's not a common ingredient in most everyday skincare, and there isn't a lot of research on how it affects skin long-term. Because it's a salt form of iodine, it could potentially irritate sensitive skin or cause reactions in people with iodine sensitivities.

What does Tea Hydroiodide do in a beauty product?

It works by releasing small amounts of iodine, which can help inhibit the growth of microbes, thereby extending the shelf life of the product. It also helps maintain the pH and stability of the formula.

Is Tea Hydroiodide safe for most people?

Tea Hydroiodide is considered safe for use in cosmetics at low concentrations, but the lack of robust safety data and potential for irritation means it is not a preferred preservative for sensitive skin.

Who should be careful with Tea Hydroiodide?

Individuals with iodine allergies or sensitivities Those with very sensitive or reactive skin

Research sources

CosIng (EU Cosmetic Ingredient Database)OpenPubMed - Iodine and skin irritationOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.