A small molecule produced inside your cells during the breakdown of certain fats and proteins, which builds up in your blood when vitamin B12 is low or when the energy-producing machinery inside your
| # | Retailer | Lab | Seen | Price | |
|---|---|---|---|---|---|
| 1 | Instalab via Multi-lab (4) · seen today | Multi-lab (4) | today | $71 | order → |
| Vitamin B12 | 16 retailers | $10 |
| Ferritin | 15 retailers | $9 |
| Magnesium RBC Test | 14 retailers | $8 |
| Calcium, Ionized | 14 retailers | $18 |
| Iodine Test | 13 retailers | $30 |
| Selenium | 12 retailers | $12 |
| Iron Test | 11 retailers | $13 |
| Zinc, Blood Test | 11 retailers | $11 |