iOSAT vs ThyroSafe: Complete Head-to-Head Comparison
These are the two FDA-approved potassium iodide tablet products available in the United States. Both provide genuine, government-verified protection against radioactive iodine. The right choice depends entirely on your household composition, budget, and storage preferences.
| Feature | iOSAT 130mg | ThyroSafe 65mg |
|---|---|---|
| FDA Status | NDA-Approved (1982) | ANDA-Approved |
| Manufacturer | Anbex, Inc. (Virginia, USA) | Recipharm AB (Sweden) |
| Strength | 130mg per tablet | 65mg per tablet |
| Adult Dose | 1 tablet | 2 tablets |
| Child Dose (3-12) | ½ tablet (split required) | 1 tablet (no splitting) |
| Shelf Life | 10 years | 6-7 years |
| Packaging | Individual foil seals | Bottle / blister packs |
| Price (smallest pack) | ~$19.95 (14 tablets) | ~$12-$15 (20 tablets) |
| Cost per Adult Dose | $1.43 | $1.20-$1.50 |
| Contains Lactose | No | Yes |
| Scoring | Double-scored | Cross-scored (quartering) |
Winner by Scenario
Adults Only → iOSAT Wins
If your household is all adults (18+), iOSAT is the clear winner. One tablet = one dose, no math needed. The 10-year shelf life means you buy once and forget about it for a decade. Individual foil sealing protects each dose independently.
Families with Children → ThyroSafe Wins
If you have children aged 3-12, ThyroSafe 65mg is dramatically easier to use. One tablet = exact pediatric dose. No splitting, no guessing. The cross-scoring means you can quarter tablets for younger children (32mg for ages 1 month to 3 years). For infant dosing, the liquid ThyroShield oral solution is still preferred.
Long-Term Stockpiling → iOSAT Wins
iOSAT's 10-year shelf life vs ThyroSafe's 6-7 years means 30-40% fewer replacement cycles. For preppers building a 10+ year supply, iOSAT's longevity is meaningful. However, the NRC states KI tablets are "inherently stable" — both products will likely work long past their expiration when properly stored.
Budget Priority → ThyroSafe Wins (Slightly)
ThyroSafe's 20-tablet packs at $12-$15 provide more total doses at a slightly lower per-dose cost. However, the difference is modest — both are affordable for a family supply. If budget is your primary concern, supplement-grade KI is dramatically cheaper than either FDA product.
Our Recommendation
Buy both. Seriously. A 14-tablet iOSAT pack ($19.95) plus a 20-tablet ThyroSafe pack ($12-$15) gives you 14 full adult doses and 20 pediatric/flexible doses — approximately $32-35 total. That covers a family of four for nearly two weeks of continuous protection. At that price, the "which one should I choose?" debate is solved by choosing both.