Key takeaways
- Dual source only the materials that can stop production.
- The second source must be qualified in advance, not during a shortage.
- Split the volume so both sources stay active and competent.
Dual sourcing means qualifying two independent sources for a critical material or component so that a failure at one does not stop production. It costs more per unit and protects against a disruption that may never happen, which makes it a decision about risk tolerance rather than about price.
1. What to dual source
Dual source the materials that can stop a line: a specialty active with one global producer, a custom bottle with one mould, a pigment with one supplier. Commodities with many suppliers, such as glycerin or petrolatum, do not need a second source; the market is the second source.
2. The qualification cost
Qualifying a second source requires a trial batch, a stability check and often a sensory comparison. That is the expensive part, and it is why dual sourcing is rarely done until after the first disruption. Budget for it as insurance rather than as a cost saving.
3. Volume split
An 80/20 split keeps the primary supplier efficient and the secondary supplier active. A 50/50 split keeps both competent and loses the volume discount on both. A second source that has not received an order in two years is not qualified in practice.
4. The qualification batch
The second source’s material must be run through the actual formula and tested for stability, colour and scent. A certificate review is not a qualification. A pigment from a second supplier can pass every specification and still shift the shade by 2 ΔE.
5. Documentation
Keep the qualification report, the certificate of analysis, the comparison data and the approval sign-off for each source. When the primary fails, the file is what allows a switch in days rather than weeks.
6. The cost of a stop
A stopped line costs the batch, the labour, the late delivery and the customer relationship. For a product with a six-week lead time, a two-week material delay pushes the launch by a month. The insurance premium is small compared with that.
7. Component dual sourcing
For packaging, dual sourcing means a second moulder with the same tool or a second tool. A tool can be transferred if the brand owns it; if the supplier owns it, the brand cannot move it. Ownership is the precondition for component dual sourcing.
8. Geographic risk
Two sources in the same region share the same risk: a port closure, a power cut, a regulation. A second source in a different region is real diversification. This is a supply-chain design question rather than a purchasing one.
9. Contract terms
The second source needs a supply agreement with a capacity commitment, or it will prioritise its larger customers when demand tightens. A qualification without a capacity commitment is a qualification that disappears in a shortage.
10. When not to
A brand with a single product and a small volume cannot afford dual sourcing and should instead hold safety stock. Six to eight weeks of buffer stock is the practical alternative and it costs warehousing rather than qualification.
11. Where it fits
Supply continuity runs across the centella range; the qualification side continues in the qualification entry.
Reference: Supply continuity plans and qualification records, 2025
