Most capsule projects are discussed in terms of the fill: the oil blend, the active level, the texture on skin. The shell rarely receives the same attention, yet it decides which markets the product can enter, how long the formula stays fresh, and how the capsule behaves on a filling line. Choosing between food-grade gelatin and a 100% plant-based shell is therefore a commercial decision as much as a technical one.
CapsulesBiotech produces soft capsules in both shell types on the same site, so brands can compare them under identical filling conditions. The six factors below cover what matters most when a brand selects a shell for a facial oil, eye serum, hair oil, body lotion, cream, or mask line.
None of these factors is automatically decisive. The right answer depends on where the product is sold, how it will be stored, and what the fill demands.
Begin With the Claim You Need to MakeThe fastest way to narrow the choice is to list the claims the brand intends to print. A vegan claim generally requires a plant-based shell, since gelatin is animal derived. Halal buyers often ask for documentation that a gelatin shell cannot always supply, while a plant shell removes the question entirely. Mainstream lines that make no dietary claim may find gelatin perfectly acceptable.
- Vegan, vegetarian, or plant-based positioning: specify a 100% plant-based shell from the start.
- Halal or kosher certification targets: confirm the shell source before sampling.
- Mass-market lines with no dietary claim: both shells remain open.
A soft capsule protects its fill by sealing it away from air, light, and contamination. Gelatin offers a dense protein film with good mechanical strength. Plant-based shells have improved considerably and now deliver comparable protection for most oil-based fills, particularly when the shell is pigmented or opacified to reduce light transmission. For highly oxidation-prone actives, shell color and wall thickness deserve as much attention as the shell polymer itself.
Fill Compatibility Decides More Than MarketingShell chemistry interacts directly with the fill. Gelatin performs well with anhydrous oils and with many emulsified creams where water activity is controlled. Plant-based shells can be more sensitive to certain solvents and to very low pH systems, and they may need adjusted plasticizers to stay flexible across shelf life. A cream capsule and an eye serum capsule can therefore call for different shell specifications within one brand portfolio.
- Anhydrous facial, hair, and body oils: both shells work, with plant shells increasingly preferred.
- Emulsified creams and lotions: run a compatibility trial before locking the shell.
- Fragrance or solvent-heavy fills: check plasticizer migration early.
Filling yield depends on shell elasticity, seam strength, and drying behavior. Gelatin has decades of process data behind it and runs quickly on standard equipment. Plant-based shells can demand tighter humidity control and slightly longer drying, which affects scheduling rather than feasibility. Unit cost is usually close; the larger variables are minimum order quantity, tooling for a custom shape, and the number of stability batches a brand is prepared to run.
Where a brand plans several SKUs, one shell platform across the range usually saves more than optimizing a single SKU for a few cents of shell cost.
The practical route is to sample both shells with the real fill, then compare feel, seal integrity, and appearance after accelerated storage. CapsulesBiotech can run that comparison inside one project. Send your target market and price positioning, and the factory will propose a formula direction, capsule fill size, shell specification, and production schedule.