Blog
How to Read Your Sebum Test Results
The test takes five seconds. Making sense of it takes slightly longer, and that is the part that actually changes your routine.
What the strip is measuring
The strip responds to sebum, the oil your scalp produces naturally. Sebum is not the enemy. It protects the skin barrier and helps hair stay flexible. The question is whether you are producing too much, too little, or roughly the right amount.
Color intensity maps to oil level. Compare against the chart in your kit rather than judging by eye alone, because lighting changes how the strip looks.
Reading the four results
| Result | What it means | Where to start |
|---|---|---|
| Balanced | Sebum in a healthy range | Rosemary Maintain |
| Oily | Overproduction, usually at the crown | Mint Revive |
| Dry | Underproduction, often with tightness | Chamomile Restore |
| Combination | Mixed zones across the scalp | Targeted, by zone |
Test in the right conditions
A result is only useful if the conditions were right. Test 24 hours after washing, not immediately after, and not four days later. Testing too soon reads the shampoo. Testing too late reads accumulated buildup rather than daily production.
- Wait a full 24 hours after washing
- Do not apply product between washing and testing
- Test the crown, the hairline, and the nape separately
- Test at a similar time of day each time you retest
Why zones matter
Testing one spot and treating the whole head is how combination scalps get mistreated. The crown often runs oilier than the nape. If your three strips disagree, that disagreement is the result, and it points to combination.
Two strips reading differently is not a failed test. It is the most useful result you can get, because it tells you where to apply and where to hold back.
When to retest
Give any change four to six weeks before judging it. Scalp turnover is slow, and switching products weekly makes it impossible to tell what worked.
- Test and record your baseline
- Change one thing
- Hold that routine for four to six weeks
- Retest under the same conditions
- Compare against your baseline, not against how you feel that morning
Retest sooner if something changes sharply. A new medication, a house move to a different climate, or a season change can all shift sebum production faster than the normal cycle.
If the result surprises you
People with visibly greasy roots sometimes test dry. That combination usually means the scalp is underproducing and the visible oil is product residue rather than sebum. Clarifying and retesting clears it up.
The reverse also happens. Flaking with an oily result is more often buildup than dryness, and adding oil to it makes matters worse.