A bottle is the first thing a customer touches, and one of the last things a brand thinks carefully about. The choice between HDPE, PET, glass and aluminium affects cost, shelf appearance, light and moisture protection, and — for some markets — whether the closure itself is legal to sell.
This guide covers the common bottle materials for tablets, capsules and powders made in Japan, how Japanese food-contact rules treat the resin they are made from, and where closure requirements differ between your market and Japan’s.
💬 Deciding on bottle material and closure for a Japan-made supplement? We confirm the packaging spec against Japanese food-contact rules before quotation. See Japan-made supplement OEM.
Bottle materials and what they suit
HDPE and PET cover most tablet and capsule bottles; amber glass and aluminium are chosen for light- or oxygen-sensitive formulas.
| Material | What it is | Strengths | Watch-outs |
|---|---|---|---|
| HDPE (high-density polyethylene) | Opaque plastic, usually white or coloured | Low cost, good moisture barrier, light and shatterproof | Not transparent; limited chemical resistance to some flavour oils |
| PET (polyethylene terephthalate) | Clear or tinted plastic | Transparent so the product is visible, recyclable, good clarity | Weaker oxygen barrier than HDPE for long-term storage |
| Amber or cobalt glass | Tinted glass | Strong barrier to light and gas, inert (no interaction with contents), premium look | Heavier, breakable, higher freight cost |
| Aluminium | Metal bottle or tube | Complete barrier to light and oxygen, lightweight versus glass | Higher unit cost, needs an internal lacquer compatible with the formula |
How Japan regulates the resin
Since Japan’s positive list for food-contact synthetic resins became fully mandatory, a bottle’s plastic must be made from a listed base resin and listed additives.
Japan introduced a positive list system for food-contact utensils, containers and packaging under an amendment to the Food Sanitation Act, which took effect on 1 June 2020. Manufacturers had a transition period to bring materials into compliance; that transition ended on 31 May 2025, and since 1 June 2025 synthetic resin used in food-contact containers and packaging must be made from a base resin and additives that are individually listed, unless it qualifies for a specific exemption. This applies to HDPE and PET bottles, caps and any resin components that touch the product directly.
For a brand sourcing from Japan, this mainly affects due diligence rather than choice: ask the factory or its resin supplier to confirm that the bottle and cap resin comply with the positive list, and keep that confirmation with your specification file. Glass and aluminium are not synthetic resins and fall outside the positive list system, though any plastic liner or lacquer inside them is covered.
Closures, seals and tamper evidence
An induction seal under the cap and a tamper-evident band or shrink sleeve are standard on Japan-made supplement bottles; child-resistant closures are an added requirement in some markets.
- Induction seal. A foil liner heat-sealed to the bottle mouth, broken on first opening. Common on both Japanese domestic and export bottles, and it also improves the moisture and oxygen barrier until the seal is broken.
- Tamper-evident band. A perforated plastic band around the cap, or a full-bottle shrink sleeve, that shows visible damage if opened before sale.
- Child-resistant closures. Required in the United States for any dietary supplement containing 250 mg or more of elemental iron per package, at a concentration of 0.025% or more by weight for liquids or 0.05% or more by weight for non-liquids, under the US Poison Prevention Packaging Act regulations (16 CFR 1700.14). Powdered preparations at or below 0.12% elemental iron by weight are exempt, as are preparations where iron is present only as a colorant. Japan has no equivalent blanket requirement for supplement bottles, so a formula that needs a child-resistant closure for the US market needs it specified from the start — it is a cap and bottle-neck design decision, not something added later.
- EU and other markets. The EU does not mandate child-resistant closures for food supplements generally, though products supplied with a dosing device sometimes use one voluntarily. Confirm your own market’s rule for the specific formula rather than assuming Japan’s or the US’s requirement applies.
Choosing between materials
Match the bottle to what the formula is sensitive to, then confirm the resin and closure against both Japan’s rules and your destination market’s.
- Light sensitivity. Formulas with light-sensitive actives (some vitamins, certain botanicals) suit amber glass or an opaque HDPE bottle over clear PET.
- Moisture and oxygen sensitivity. Powders and probiotics often pair a barrier bottle with a desiccant or oxygen absorber inside rather than relying on the bottle material alone.
- Iron content. If the formula contains iron near or above the US 250 mg threshold, confirm early whether a child-resistant closure is needed, since it changes the bottle-and-cap tooling.
- Shelf appeal versus cost. Clear PET or glass show the product; opaque HDPE hides it but costs less and protects light-sensitive actives better.
- Resin compliance. Ask for written confirmation that the bottle and cap resin comply with Japan’s positive list for food-contact synthetic resin.
💬 Need to confirm whether your formula requires a child-resistant closure, and which bottle material suits it? Tell us the formula and your markets.
Before you ask for a quotation
- Bottle material (HDPE, PET, glass or aluminium) and colour or tint
- Bottle size and fill count (tablets or capsules per bottle, or powder weight)
- Closure type: standard screw cap, child-resistant, or dispensing cap
- Seal type: induction seal, tamper-evident band or shrink sleeve
- Whether the formula contains iron near the US child-resistant threshold
- Countries you will sell in, and their closure and resin requirements
💬 Ready to specify bottle, cap and seal for a Japan-made supplement? Send us the formula and destination markets.
Frequently asked questions
1. Does Japan require child-resistant caps on supplement bottles?
No general requirement exists for supplements in Japan. The clearest child-resistant requirement in major export markets is the US rule for supplements with 250 mg or more of elemental iron per package, above set concentration thresholds.
2. Can I still use HDPE or PET bottles made in Japan after 2025?
Yes, provided the resin and additives are on Japan’s positive list for food-contact synthetic resin. The transition period ended 31 May 2025, so compliance is now the standard requirement rather than optional.
3. Is glass better than plastic for supplement bottles?
Not universally — glass gives a stronger light and gas barrier and a premium look, but it is heavier, breakable and costs more to ship. Plastic suits most tablet and capsule products; glass suits light-sensitive or premium formulas.
4. Do I need an induction seal as well as a tamper-evident band?
Many Japan-made supplement bottles use both: the induction seal protects the product and shows first-opening, and the band or shrink sleeve gives a visible tamper check before the cap is even touched. Requirements vary by destination market, so confirm what yours expects.
5. Who confirms that the bottle resin meets Japan’s positive list?
The factory or its packaging supplier should provide written confirmation for the resin and additives used. Ask for this alongside the rest of your specification documents.
Sources: Consumer Affairs Agency, “食品用器具・容器包装のポジティブリスト制度について (2025年6月1日以降)”, caa.go.jp; 16 CFR 1700.14, “Substances requiring special packaging”, ecfr.gov / law.cornell.edu. Checked on 25 September 2026.