Ingredients

Tetrahydroxypropyl Ethylenediamine

A pH-adjusting ingredient used in small amounts to bring cosmetic formulas to their intended acidity or alkalinity.

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Quick facts

INCI name
Tetrahydroxypropyl Ethylenediamine
CAS number
102-60-3
Origin
Synthetic
Chemical class
Amino alcohol
What it does in a formula
buffering, pH adjusting
Why it is in the formula
It helps adjust a formula's pH so the finished product stays within its intended range.

What it is

Engineered with hydroxypropyl groups attached to an ethylenediamine core, tetrahydroxypropyl ethylenediamine is a synthetic amino alcohol used primarily as a neutralizing and pH-adjusting agent. Added in minute quantities, it balances formula acidity to optimize emulsion stability and product feel.

You may find it in moisturizers, serums, cleansers, and other products where keeping pH in a suitable range matters. The ingredient list does not tell you the final pH or the exact amount. Those depend on the complete formula and its intended use.

What it does

  • Adjusts pH. It helps move a formula toward its target acidity or alkalinity.
  • Supports formula performance. pH can affect product stability and how some ingredients behave together.
  • Helps product consistency. A well-controlled formula is more likely to maintain its intended properties during ordinary use.
  • Acts in the background. It is a processing and formulation helper, not the reason to choose a product for a skin concern.

Who it suits

Most people encounter this ingredient as one part of a finished formula rather than as a standalone product. Its presence alone does not tell you the product’s pH or predict how it will feel. The complete formula, product type, and directions matter more than this pH adjuster by itself.

If you have reactive skin, any finished product can cause individual discomfort. Stop using a product that repeatedly irritates you and consider all ingredients and usage habits. Do not try to infer the final formula’s pH from a single ingredient name. For recurring reactions or a skin condition, ask a dermatologist for help.

What to pair it with, and what not to

There is nothing to pair with tetrahydroxypropyl ethylenediamine in your routine. It is already included to adjust the pH of a particular product. Use that finished product according to its directions, and choose other steps based on your skin’s needs and the textures you prefer.

Skin Realist check: The best pH adjuster is one you never notice. If you are thinking about it, the formula has lost the plot.

Quick picks with Tetrahydroxypropyl Ethylenediamine

Picked from label facts only. We haven't tested these products.

All 5 products with Tetrahydroxypropyl Ethylenediamine

Body Creams, Butters & Body Oils (1)

Daily Sunscreens & SPF Moisturizers (1)

Anti-Aging & Retinoid Serums (1)

Targeted Vitamin C & Brightening Correctors (1)

Eye Creams & Under-Eye Patches (1)

Common questions

What does tetrahydroxypropyl ethylenediamine do?

It is used in small amounts to adjust the pH of a cosmetic formula. That helps a product reach the acidity or alkalinity its formulator intends.

Is tetrahydroxypropyl ethylenediamine an active ingredient?

Usually not. It is a formula-adjusting ingredient, not a treatment active chosen to change the look of skin.

Why does a moisturizer need a pH adjuster?

A formula's pH can affect its stability, preservation, and how selected ingredients behave. A pH adjuster helps bring the mixture to its target range.

Is tetrahydroxypropyl ethylenediamine the same as ethylenediamine?

No. It is a modified derivative with hydroxypropyl groups attached. Similar names do not mean the ingredients have identical properties or uses.

Sources