Does it work for carpet beetles?

Yes, however it has not worked on carpet beetle larvae. I actually put several larvae in an empty pill bottle with about 1/4" DE covering the bottom. A week later they were all still alive. I wouldn't recommend buying this and expecting good results if you have evidence of carpet beetles and their larvae throughout your home.

Description says 100% Diatomaceous Earth, bottle states 85% active ingredient, 15% other ingredients. What are other ingredients?

I reached out to the company regarding this and this is what they said, "Any product claiming to kill insects must be registered with the EPA and the EPA requires the ingredients for the Crawling Insect Killer (diatomaceous earth) to show 15% “other” to represent moisture and trace elements as it is a product mined from the earth and it cannot say Food Grade and also say that it kills insects. There are no additives or fillers. Harris Food Grade Diatomaceous Earth cannot be registered with the EPA and claim it kills insects; the label can say 100% diatomaceous earth. The ingredients are identical. The difference is the packaging and labeling."

How to apply it in a bedroom and on a bed?

Do not apply where you are likely to inhale it directly. Let any clouds dissipated. While not toxic, any fine powder in your lungs can do harm.

Does this kill millipedes?

It says it does, I don't have those so I can't swear to it. Good luck.

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Harris Diatomaceous Earth Crawling Insect Killer, 8oz for Roaches, Fleas, Ants, Bed Bugs, and More…

Harris Diatomaceous Earth Crawling Insect Killer, 8oz for Roaches, Fleas, Ants, Bed Bugs, and More…

Product ID: 184702290

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Details

Item Weight
8 Ounces
Liquid Volume
227.3
Brand
HARRIS
Specification Met
EPA
Target Species
Insects

🌿100% natural, chemical-free

🎯Precision puffer tip for targeted use

🦗Kills 7+ crawling insect types

Description

🛡️ Natural pest control that means business—because your home deserves the best!

MULTI PEST MASTERY - Eradicates ants, roaches, bed bugs & more with one powerful formula
LONG LASTING DEFENSE - Stays effective indoors and outdoors as long as it stays dry
PRECISION APPLICATION - Built-in puffer tip delivers powder exactly where pests hide—no mess, no waste
ECO SAFE FAMILY FRIENDLY - Pure diatomaceous earth, non-toxic and safe around kids and pets
MECHANICAL KILL NO CHEMICALS - Dehydrates insects on contact—no harsh toxins, just science

HARRIS Diatomaceous Earth Crawling Insect Killer is a trusted, EPA-registered, 100% natural powder that mechanically kills a broad spectrum of crawling insects by dehydrating them on contact. Safe for use around children and pets, it offers long-lasting indoor and outdoor protection with a precision puffer tip for targeted application. Ideal for eco-conscious professionals seeking effective, chemical-free pest control.