Choosing between specifications matters more than choosing between suppliers in the early stage of a purchase. In the Collagen category the platform currently carries 15 listings across 10 distinct specifications. This table sets each commonly offered specification against the unit prices actually published for it, so you can see which differences are cosmetic and which change the cost.
Specification vs. published unit price
Specification
Listings
Lowest
Highest
Per vial
4
20
39
Per piece
2
20
25
essence for multiple skincare effects
1
15
15
Single bottle facial essence for professional skin care
1
2.5
2.5
1 bottle per piece
1
20
20
Per single vial
1
4.5
4.5
For professional beauty salon use, customizable private label formulation
1
15
15
Professional facial care lotion for salon use
1
15
15
For beauty salon use, OEM/ODM private label service
1
6
6
Per vial stock solution
1
20
20
Prices are the published unit prices in US dollars for the listed specification. Where a specification appears with a wide range, the spread almost always reflects pack size, concentration or the unit of sale rather than a pure price difference — open the individual listings before drawing a conclusion.
What to check before you order
Confirm the unit. The same specification may be sold per vial, per box, per pair or per set. Convert every quotation to a single unit before comparing.
Fix the concentration or fill. Where a specification lists options (for example two fill weights), state in writing which one your order refers to — this is the single most common source of a shipment that technically matches the product name but not the purchase order.
Ask for the documentation. A certificate of analysis and test report tied to the lot number is what lets you verify conformance on arrival.
Sample a new specification. If you are moving to a specification you have not bought before, order a sample lot first; the cost is small relative to the risk of a production quantity that cannot be used.
Selection logic that generally holds
For a first order, the lowest price is rarely the correct basis for a decision. A mid-range specification from a supplier who can state a consistent fill weight, provide documentation and hold the specification over repeat orders is normally the lower-risk choice, and it usually turns out cheaper once rework, claims or a failed batch are priced in. Reserve the lowest-priced small-pack listings for trial quantities where you are buying specifically to evaluate, not to consume.