Table 6.
Comparison of estimated daily intake of dietary supplements that contain vitamins and minerals
| Supplement intake | LT4-treated (n = 146) | DTE-treated (n = 73) | P-value |
|---|---|---|---|
| Takes at least 1 dietary supp per day (%) | 106 (72.6) | 63 (86.3) | .02 |
| Number of dietary supp taken per day (mean ± SD) | 2.1 ± 2.2 | 4.7 ± 4.4 | <.001 |
| Vitamin/mineral intake (mean ± SD) | |||
| Thiamin (mg) | 5.8 ± 17.0 | 22.2 ± 31.5 | .01 |
| Riboflavin (mg) | 3.7 ± 6.3 | 16.0 ± 21.6 | .002 |
| Niacin, (mg) | 90 ± 330 | 44 ± 54 | .48 |
| Vitamin B6 (mg) | 21 ± 54 | 21 ± 49 | .59 |
| Folic acid (mcg) | 441 ± 324 | 628 ± 664 | .13 |
| Vitamin B12 (mcg) | 200 ± 391 | 863 ± 1618 | .01 |
| Vitamin C (mg) | 272 ± 340 | 409 ± 533 | .18 |
| Vitamin K (mcg) | 38 ± 28 | 58 ± 50 | .07 |
| Vitamin D (mcg) | 39 ± 42 | 58 ± 54 | .06 |
| Calcium (mg) | 612 ± 522 | 571 ± 642 | .74 |
| Phosphorus (mg) | 68 ± 73 | 66 ± 44 | .93 |
| Magnesium (mg) | 86 ± 107 | 190 ± 216 | .01 |
| Iron (mg) | 13 ± 12 | 22 ± 21 | .11 |
| Zinc (mg) | 16 ± 19 | 15 ± 10 | .80 |
| Copper (mg) | 1.4 ± 1.0 | 1.2 ± 0.8 | .59 |
| Sodium (mg) | 12 ± 12 | 13 ± 12 | .85 |
| Potassium (mg) | 65 ± 28 | 94 ± 90 | .16 |
| Selenium (mcg) | 51 ± 46 | 93 ± 97 | .03 |
This table includes participants from the NHANES cohort only. Bold type in vitamin/mineral intake indicates significance of p-value <0.05.
Abbreviations: DTE, desiccated thyroid extract; LT4, levothyroxine; NHANES, National Health and Nutrition Examination Survey; supp, supplement.