130mg vs 65mg Potassium Iodide: Which Dose Should You Buy?
The FDA dosing guidelines define two standard tablet strengths: 130mg (full adult dose) and 65mg (pediatric dose for ages 3-12 and adults who need half-doses). Understanding the difference helps you choose the right product for your household.
When 130mg Is the Right Choice
- Adults 18-40: One 130mg tablet = full dose, no splitting needed
- Adults over 40: Same dose, but should only be taken at higher exposure thresholds
- Pregnant/breastfeeding women: 130mg per dose
- Adolescents 12-18 over 150 lbs: 130mg per dose
When 65mg Is the Right Choice
- Children 3-12: 65mg = one whole ThyroSafe tablet (vs splitting a 130mg tablet)
- Adolescents 12-18 under 150 lbs: 65mg per dose
- Families needing flexibility: Two 65mg tablets = adult dose; one = child dose
- Younger children (1mo-3yr): Half of 65mg (32.5mg) is easier to split than quarter of 130mg
Cost Comparison per Effective Adult Dose
| Product | Strength | Tablets per Adult Dose | Cost per Adult Dose |
|---|---|---|---|
| iOSAT | 130mg | 1 | ~$1.43 |
| ThyroSafe 65mg | 65mg | 2 | ~$1.20-$1.50 |
| ThyroShield (supplement) | 130mg | 1 | ~$0.12-$0.17 |
Our Recommendation
If your household is adults only, 130mg tablets (iOSAT) are simpler. If you have children ages 3-12, 65mg tablets (ThyroSafe) eliminate dosing guesswork. For mixed households, consider buying both — they're complementary, not competing.