Bi-Phase Hair Serum OEM: Check Every Dose After Shaking
Evaluate bi-phase hair serum OEM samples with a practical dose plan. Check mixing, pauses, fill levels and dispensing before approving a two-phase pack.
A two-phase serum should deliver a representative dose when used according to its directions, across the useful life of the pack. Evaluate the formula and dispenser together, including the first dose, a delayed dose and doses taken near empty.
A current signal, with a clear limit
Nutrafol described a two-phase strand serum in its September 30, 2026 announcement. This establishes a recent format signal, not a requirement for every hair serum. Source: official launch release.
The brand's current product directions include shaking before application. That is a useful reminder to treat instructions as part of the development brief. Source: official product directions, reviewed October 4, 2026.
Procurement inference: a visually attractive phase split creates additional sampling questions. It does not, by itself, establish better conditioning or strand performance.
Write an observable mixing instruction
“Shake well” is a starting point, not a complete assessment procedure. Ask the supplier to propose a reproducible motion and duration, then check whether ordinary users can follow the resulting directions without laboratory supervision.
For development, record the bottle orientation, number of motions, elapsed time after mixing and appearance. The test procedure can be more detailed than the final label, but it should represent a realistic consumer action.
Separate appearance from dose composition
A uniform-looking bottle does not prove every dispensed portion has the same composition. Ask the laboratory to select a suitable analytical marker or another justified method for checking dose consistency. The method must suit the formula; no universal marker is prescribed here.
Build a small sampling matrix
| Condition | What to record | Decision supported |
|---|---|---|
| Immediately after instructed mixing | Dose mass and selected composition measure | Initial delivery |
| After a realistic application pause | Same measures and appearance | Practical use window |
| Midway through the pack | Delivery and remixing effort | Routine consistency |
| Near the useful end of the pack | Residual product and delivery | Usable quantity |
| After agreed storage conditions | Remixing and dispensing behavior | Formula-pack suitability |
This is a proposed development screen. Storage conditions, replicates, tolerances and analytical methods need project-specific approval. It is not a substitute for a complete stability or safety program.
Droppers and pumps need different checks
For a dropper, evaluate how much product the user picks up at a realistic squeeze and how dose changes with bottle angle. Counted drops can be convenient directions, but measure their mass rather than assuming a fixed volume.
For a pump, include priming, repeated actuation and recovery after standing. Specify whether partial strokes are allowed. A pump selected using one fluid may behave differently with the actual two-phase sample, so approve the filled pack.
Test multiple units. One successful demonstration bottle is not evidence of consistent production.
How to make the procurement decision
If delivery drifts outside the agreed range, identify whether changing the formula, dispenser or instructions is the least complicated fix. Retest the chosen combination rather than mixing approvals from separate samples.
Keep an alternative single-phase concept available if the required mixing step causes poor user compliance. The final choice should balance the intended finish, reliable delivery, development cost and ease of explanation.
The approval file should include formula version, pack components, filling conditions, mixing directions, sampling results and the approved use instruction. A change to the dip tube or dropper may require another delivery check.
FAQ
Is visible separation a defect?
Not necessarily in an intentionally two-phase product. The relevant questions are whether it remixes as intended and delivers acceptable doses.
Can a dropper be approved before the formula?
Only as a preliminary component choice. Final approval should use the intended filled formula.
Does this sampling screen prove shelf life?
No. It answers a delivery question. Agree the full stability, compatibility and safety work separately.
Related products and Contact
Use the serum-containing anti-frizz care system as a routine starting point, and review existing hair-care products for alternative formats. A two-phase adaptation needs feasibility confirmation.
Contact the OEM team with the desired finish, dose, pack style, application instructions, destination market and quantity. Request a filled-pack sampling plan before selecting the final dispenser.