What Body Hair Can Be Used for Drug Testing? Chest, Arm, Leg, Underarm, Beard and the Time Window Each Covers

Updated 18 Oct 2026 · By the DrugTestAnswers editorial team

If your head hair is shaved, very short or heavily treated, a hair drug test doesn't just get cancelled. The collector usually moves to body hair, and that changes what the result can show. Chest, underarm, arm and leg hair are the usual fallbacks, beard hair is sometimes used, and rules on pubic hair vary by lab. Body hair grows slower and rests longer than head hair, so it can reflect drug use going back further than the familiar 90 days, with no way to pin down exactly when. Here is which hair can be taken, how each type behaves, and what is worth knowing before your appointment. We may earn a commission if you buy through our links.

The short answer

Almost any body hair with enough length and weight can be tested. In practice collectors work down a list: head hair first, then underarm, chest, leg or arm hair, and in some programs facial hair. The lab needs a sample big enough to run a screen and a confirmation, which for body hair often means gathering hair from more than one spot. What matters for you is the time window. A standard head hair sample of about 1.5 inches is read as roughly the last 90 days. Body hair has no reliable inch-to-month conversion, so labs usually describe it as covering a longer period, often quoted as up to about a year, rather than a set number of days.

When a collector switches to body hair

• Head hair too short. Labs need enough length near the scalp to collect a usable amount. A buzz cut or shaved head usually means body hair.
• Not enough hair. Thinning hair, alopecia or a bald crown may not give the weight needed.
• Hair the program doesn't accept. Some employer or lab policies note heavily bleached or damaged hair. Policies differ, and collectors follow whatever the testing program allows.
• Religious or medical reasons. Some people can't have head hair cut. Body hair is the usual alternative, and you can raise this with the employer before the appointment.

The collector writes down where the hair came from on the custody form. That location goes to the lab and can matter when the result is reviewed.

Each type of body hair, compared

Why body hair can look further back

Every hair cycles between growing (anagen) and resting (telogen). On the scalp most hairs are in the growth phase at any time and grow fairly steadily, which is why labs can translate length into months. Body hair is different:

• It grows slower. A short body hair can represent many months of growth.
• More of it is resting. A larger share of body hairs sit in the resting phase at any moment, still attached but no longer growing. A resting hair can hold drug from months back.
• It's a mix. A sample is a bundle of hairs at different stages, so the result blends a long and uneven stretch of time.

So body hair can't be cut into dated segments the way head hair sometimes is. A positive tells the reviewer that drug was in the body at some point covered by those hairs, without saying when. For more on the growth math, read how long it takes to pass a hair follicle test.

What it means if you stopped using recently

People who stopped two or three months ago and shaved their head sometimes find body hair works against them. If the head hair would have mostly grown out the use period, body hair may still hold it. If you have been clean for a long time, body hair may already be clear. The point is that a buzz cut doesn't erase the history; it often moves the test to hair with a longer memory.

How much hair the lab needs

Labs ask for a set weight, commonly described for head hair as a lock about the width of a pencil. Body hair is shorter, so the same weight takes more hairs. Collectors typically cut close to the skin with clean scissors, wrap the sample in foil and seal it in an envelope in front of you. Expect them to take from one area first and add a second area if needed. Shaving every body area right before the appointment can lead to a delayed collection, a note on the paperwork, or a different test, depending on the program's rules.

Does body hair give a different result than head hair?

It can. Research comparing head and body hair from the same people has found that concentrations differ between sites, sometimes higher in body hair and sometimes lower, depending on the drug and the person. Underarm hair may also pick up drug through sweat. That is one reason labs record the site and why a reviewer may read body hair results more cautiously. Cutoffs on standard panels are set around head hair, and some guidelines treat body hair as an acceptable substitute rather than an equal one.

Product facts: detox shampoos on body hair

If you're switching to body hair, you're probably also wondering whether products help. The one most hair-test guides start with is Old Style Aloe Toxin Rid from TestClear.

• What TestClear says: it is a deep-cleansing shampoo meant to remove buildup and residue from hair.
• Maker's directions in short: wash with regular shampoo, massage Aloe Toxin Rid into damp hair, leave it 10 to 15 minutes, rinse, and repeat over the days before the test. People facing a body hair test usually apply it to every area that might be collected, not just the scalp.
• What is not proven: there is no independent published study showing it gets anyone past a hair test, head or body. Treat reviews as anecdotes.
• Skin care: underarm and groin skin is thinner and more sensitive. Rinse well and stop if it stings or turns red.

You can see Old Style Aloe Toxin Rid at TestClear, and our Aloe Toxin Rid review and how-to guide covers directions and schedules in detail.

Keep harsh routines off your skin

Routines like the Macujo method (vinegar, a salicylic acid cleanser and detox shampoo) and bleach treatments are written about head hair. On underarms, chest or groin they can burn and irritate skin badly. Never mix bleach with vinegar, ammonia or any other acid or cleaner, because the combination can release toxic gas. Our page on the Macujo method step by step describes what people do and the safety warnings.

Test your own body hair first

A home hair test kit lets you send a sample to a lab and see the result before the real collection. If your head hair is too short, you can send body hair in the kit too; check the kit's instructions for the amount. A negative saves you money and worry, and a positive tells you where you stand while you still have time to plan. Compare options in our guide to the best hair follicle drug test kits.

Prescriptions and honest answers

If you take a prescribed medicine that a panel looks for, keep the prescription details handy. In most employer programs a medical review officer, a doctor who reviews lab results, will contact you about a confirmed positive and ask about prescriptions before reporting it. Being upfront at that stage is usually the most useful thing you can do.

Our sourcing

Hair growth cycle facts come from dermatology references. Body hair use in testing and the differences between collection sites come from published forensic toxicology research and Society of Hair Testing guidance. Product directions come from TestClear's product page. We don't run lab tests or publish testimonials; see our editorial methodology.

Tests this page doesn't apply to

Don't use any product or routine on this page to try to affect a DOT-regulated test, FAA aviation testing, federal employee programs, military testing, or court, probation and parole testing. Tampering with those can count as a refusal and may be illegal.

Disclaimer and help

Informational only, not medical or legal advice. Tampering with a drug test may be illegal and can count as a refusal or failed test. The only guaranteed way to pass is abstinence. For free, confidential support 24/7, call the SAMHSA National Helpline at 1-800-662-4357. If you're in crisis, call or text 988.