Cheapest Vitamin D3 (Fermented) on iHerb
Ranked by real cost per 100 IU of Vitamin D3 (Fermented) — cheapest value first.
Prices updated Jul 25, 2026 · 25 products · Prices in USD
| # | Product | Dose | Price (USD) | Cost per 100 IU | |
|---|---|---|---|---|---|
| 1 |  | 4,000 IU | 76.99 | 0.064 | View on iHerb → |
| 2 |  | 125 mcg | 25.56 | 0.082 | View on iHerb → |
| 3 |  | 2,000 IU | 60.91 | 0.102 | View on iHerb → |
| 4 |  | 50 mcg | 19.60 | 0.157 | View on iHerb → |
| 5 |  | 250 mcg | 29.97 | 0.200 | View on iHerb → |
| 6 |  | 800 IU | 48.31 | 0.201 | View on iHerb → |
| 7 |  | 800 IU | 48.31 | 0.201 | View on iHerb → |
| 8 |  | 125 mcg | 16.97 | 0.226 | View on iHerb → |
| 9 |  | 125 mcg | 44.97 | 0.300 | View on iHerb → |
| 10 |  | 125 mcg | 13.29 | 0.354 | View on iHerb → |
| 11 |  | 125 mcg | 13.86 | 0.370 | View on iHerb → |
| 12 |  | 125 mcg | 29.13 | 0.388 | View on iHerb → |
| 13 |  | 125 mcg | 17.97 | 0.479 | View on iHerb → |
| 14 |  | 63 mcg | 22.97 | 0.613 | View on iHerb → |
| 15 |  | 50 mcg | 33.99 | 0.755 | View on iHerb → |
| 16 |  | 50 mcg | 25.99 | 0.866 | View on iHerb → |
| 17 |  | 125 mcg | 32.99 | 0.880 | View on iHerb → |
| 18 |  | 125 mcg | 33.97 | 0.906 | View on iHerb → |
| 19 |  | 50 mcg | 43.18 | 0.960 | View on iHerb → |
| 20 |  | 50 mcg | 15.49 | 1.03 | View on iHerb → |
| 21 |  | 50 mcg | 32.47 | 1.08 | View on iHerb → |
| 22 |  | 40 mcg | 55.99 | 1.17 | View on iHerb → |
| 23 |  | 25 mcg | 26.99 | 1.20 | View on iHerb → |
| 24 |  | 113 mcg | 44.99 | 1.33 | View on iHerb → |
| 25 |  | 25 mcg | 20.99 | 1.40 | View on iHerb → |
- 1Cost per 100 IU 0.064
- Dose
- 4,000 IU
- Servings
- 30
- Price (USD)
- 76.99
- 2Cost per 100 IU 0.082
- Dose
- 125 mcg
- Servings
- 250
- Price (USD)
- 25.56
- 3Cost per 100 IU 0.102
- Dose
- 2,000 IU
- Servings
- 30
- Price (USD)
- 60.91
- 4Cost per 100 IU 0.157
- Dose
- 50 mcg
- Servings
- 250
- Price (USD)
- 19.60
- 5Cost per 100 IU 0.200
- Dose
- 250 mcg
- Servings
- 60
- Price (USD)
- 29.97
- 6Cost per 100 IU 0.201
- Dose
- 800 IU
- Servings
- 30
- Price (USD)
- 48.31
- 7Cost per 100 IU 0.201
- Dose
- 800 IU
- Servings
- 30
- Price (USD)
- 48.31
- 8Cost per 100 IU 0.226
- Dose
- 125 mcg
- Servings
- 60
- Price (USD)
- 16.97
- 9Cost per 100 IU 0.300
- Dose
- 125 mcg
- Servings
- 120
- Price (USD)
- 44.97
- 10Cost per 100 IU 0.354
- Dose
- 125 mcg
- Servings
- 30
- Price (USD)
- 13.29
- 11Cost per 100 IU 0.370
- Dose
- 125 mcg
- Servings
- 30
- Price (USD)
- 13.86
- 12Cost per 100 IU 0.388
- Dose
- 125 mcg
- Servings
- 60
- Price (USD)
- 29.13
- 13Cost per 100 IU 0.479
- Dose
- 125 mcg
- Servings
- 30
- Price (USD)
- 17.97
- 14Cost per 100 IU 0.613
- Dose
- 63 mcg
- Servings
- 60
- Price (USD)
- 22.97
- 15Cost per 100 IU 0.755
- Dose
- 50 mcg
- Servings
- 90
- Price (USD)
- 33.99
- 16Cost per 100 IU 0.866
- Dose
- 50 mcg
- Servings
- 60
- Price (USD)
- 25.99
- 17Cost per 100 IU 0.880
- Dose
- 125 mcg
- Servings
- 30
- Price (USD)
- 32.99
- 18Cost per 100 IU 0.906
- Dose
- 125 mcg
- Servings
- 30
- Price (USD)
- 33.97
- 19Cost per 100 IU 0.960
- Dose
- 50 mcg
- Servings
- 90
- Price (USD)
- 43.18
- 20Cost per 100 IU 1.03
- Dose
- 50 mcg
- Servings
- 30
- Price (USD)
- 15.49
- 21Cost per 100 IU 1.08
- Dose
- 50 mcg
- Servings
- 60
- Price (USD)
- 32.47
- 22Cost per 100 IU 1.17
- Dose
- 40 mcg
- Servings
- 120
- Price (USD)
- 55.99
- 23Cost per 100 IU 1.20
- Dose
- 25 mcg
- Servings
- 90
- Price (USD)
- 26.99
- 24Cost per 100 IU 1.33
- Dose
- 113 mcg
- Servings
- 30
- Price (USD)
- 44.99
- 25Cost per 100 IU 1.40
- Dose
- 25 mcg
- Servings
- 60
- Price (USD)
- 20.99
How we rank Vitamin D3 (Fermented)
Two supplements can list the same dose per serving yet cost very differently once you account for how many servings are in the bottle. We calculate the total nutrient in each container (dose per serving × servings per container), divide the current price by that total, and rank by the resulting cost per unit. Lower is better. Because prices are refreshed automatically, this ranking reflects today's iHerb pricing rather than a snapshot from months ago.
Cost per unit is a starting point, not the whole story — the ideal form, third-party testing, and other ingredients matter too. Always check the label and consult a healthcare professional before starting a supplement.
Prices update automatically and may differ from iHerb at checkout. Rankings are based on cost per unit of the listed nutrient and are for informational purposes only — not medical advice. Links to iHerb are affiliate links.