## Common ground
All options are dietary supplements in softgel capsule form, intended for oral consumption to support health.
## Options at a glance
**1504.10 – Fish liver oil softgels**
- **Defining trait:** Made from unmodified fish liver oils (e.g., cod liver), retaining their natural character.
- **Typical examples:** Cod liver oil capsules, vitamin A/D-rich softgels.
- **Best fit when:** The primary base is fish liver oil, even if vitamins are added.
**1504.20 – Fish oil softgels**
- **Defining trait:** Made from non-liver fish oils (e.g., from mackerel, salmon), not chemically altered.
- **Typical examples:** Omega-3 fatty acid capsules from fish body oil.
- **Best fit when:** The oil comes from fish flesh or non-liver sources.
**1504.30 – Marine mammal oil softgels**
- **Defining trait:** Derived from oils of marine mammals (e.g., whales), not chemically modified.
- **Typical examples:** Sperm whale liver oil capsules, traditional seal oil supplements.
- **Best fit when:** The source is a marine mammal, not fish.
**2106.90 – Other dietary supplements**
- **Defining trait:** Not derived from fish or marine mammal oils; includes plant-based or synthetic sources.
- **Typical examples:** Vitamin E softgels (from soy), probiotic capsules, vegan DHA from algae.
- **Best fit when:** The oil base is not from fish or marine mammals.
## Key differences
| Feature | 1504.10 | 1504.20 | 1504.30 | 2106.90 |
|-----------------------|------------------|------------------|--------------------|----------------------|
| Source | Fish liver | Fish body | Marine mammal | Other (plant/synth) |
| Chemical modification | None | None | None | Not applicable |
| Vitamin enrichment | Allowed (if kept character) | Same | Same | Same |
## How to choose
- Is the oil sourced from fish liver? → 1504.10
- Is it from fish body (not liver), but not marine mammal? → 1504.20
- Is it from a marine mammal (e.g., whale, seal)? → 1504.30
- Is the base plant-based, synthetic, or non-fish/non-mammal? → 2106.90
## Overlaps & pitfalls
- A softgel with fish liver oil and added vitamins fits **1504.10**, even if enriched.
- If the product contains both fish liver oil and fish body oil, it should still be classified under **1504.10** if liver oil is dominant or defining.
- **No clear priority rule** is given; use the *main source* of oil as the deciding factor. If uncertain, classify by primary ingredient