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Home/Powders/Magnesium Stearate
Standalone Excipient · Lubricant

Magnesium
Stearate

The standard tablet lubricant. Add at 0.5–2% for the final minutes of blending only — reduces friction between the tablet and die wall so it ejects cleanly instead of sticking or tearing.

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0.5–2%
Typical Use Rate
Lubricant
Formulation Role
White powder
Appearance
3 sizes
1kg/2kg/5kg
$19.95 USD / bag

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Magnesium Stearate FIG. 01 Magnesium Stearate powder, Press & Powder branded 1kg bag
Why This Excipient

Built for
your own blend.

01

The Standard Lubricant

The near-universal choice for direct compression — reliably reduces die-wall friction so tablets eject without sticking or tearing.

02

Used Sparingly

A small amount goes a long way. 0.5–2% of the total blend is typical — more than that doesn't help ejection further and starts to work against the tablet.

03

Mixed in Last, Briefly

Added at the end of blending and mixed for only a minute or two. Overmixing coats the other particles and is one of the most common causes of soft, weak tablets.

Full Specifications

Every
number.

Confirm performance for your specific formulation with your own testing before a production run.

SpecValue
AppearanceWhite, fine powder
RoleLubricant
Physical stateSolid
Directly compressibleNot on its own — used as a minor additive
Typical use rate0.5–2% of the total blend, added last
Approx. mesh size>200 mesh (fine)
StorageRoom temperature, sealed container
Bag sizes1 kg, 2 kg, 5 kg
Bulk sizes25 kg, 500 kg pallet lots
Questions

Frequently
asked.

How much magnesium stearate should I use?

0.5–2% of the total blend is typical. Start at the low end and increase only if tablets are sticking in the die or tearing on ejection.

Why did my tablets get soft after I added more magnesium stearate?

Overmixing a lubricant coats the other particles and can weaken bonding between them under compression. Mix it in briefly, only at the end — see diagnosing capping and lamination for what over-lubrication looks like.

What does magnesium stearate actually do?

It reduces friction between the compressed tablet and the die wall, so the tablet ejects cleanly instead of sticking, tearing, or capping.

Reviews

What buyers
say.

4.7 out of 5, based on 3 reviews.

★★★★★
Olivia M. April 2026

Clean ejection at 1% — no sticking on our punches even after long runs.

★★★★★
Nathan P. February 2026

A small amount goes a long way. No issues with tablet hardness at our usual ratio.

★★★★☆
Isabella K. November 2025

Works as expected. Just watch for overmixing — it can soften tablets if you go too long.

Also Consider

Round out
the formula.

EXCIPIENT

Silicon Dioxide

The standard glidant for consistent powder flow.

View product → EXCIPIENT

Microcrystalline Cellulose

The workhorse binder-filler, 60–75% of most blends.

View product → POWDER

Standard ReadyBlend

All four roles pre-mixed into one bag, in nine colors.

View product →

Questions about magnesium stearate?

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