Cheapest L-Serine on iHerb
Ranked by real cost per 100 mg of L-Serine — cheapest value first.
Prices updated Jul 25, 2026 · 20 products · Prices in USD
| # | Product | Dose | Price (USD) | Cost per 100 mg | |
|---|---|---|---|---|---|
| 1 |  | 2,000 mg | 23.95 | 0.011 | View on iHerb → |
| 2 |  | 900 mg | 14.07 | 0.013 | View on iHerb → |
| 3 |  | 500 mg | 14.95 | 0.025 | View on iHerb → |
| 4 |  | 550 mg | 14.24 | 0.173 | View on iHerb → |
| 5 |  | 153 mg | 36.99 | 0.403 | View on iHerb → |
| 6 |  | 160 mg | 14.39 | 0.409 | View on iHerb → |
| 7 |  | 259 mg | 27.99 | 0.432 | View on iHerb → |
| 8 |  | 153 mg | 19.99 | 0.436 | View on iHerb → |
| 9 |  | 160 mg | 32.69 | 0.454 | View on iHerb → |
| 10 |  | 640 | 122.95 | 0.640 | View on iHerb → |
| 11 |  | 200 mg | 59.99 | 0.667 | View on iHerb → |
| 12 |  | 155 mg | 48.76 | 0.699 | View on iHerb → |
| 13 |  | 240 mg | 51.16 | 0.711 | View on iHerb → |
| 14 |  | 240 mg | 22.36 | 0.776 | View on iHerb → |
| 15 |  | 200 mg | 89.99 | 1.000 | View on iHerb → |
| 16 |  | 15 mg | 36.00 | 2.67 | View on iHerb → |
| 17 |  | 10 g | 47.41 | 10.54 | View on iHerb → |
| 18 |  | 10 g | 54.56 | 12.12 | View on iHerb → |
| 19 |  | 3 % | 29.59 | 30.82 | View on iHerb → |
| 20 |  | 4 g | 80.13 | 31.80 | View on iHerb → |
- 1Cost per 100 mg 0.011
- Dose
- 2,000 mg
- Servings
- 113
- Price (USD)
- 23.95
- 2Cost per 100 mg 0.013
- Dose
- 900 mg
- Servings
- 120
- Price (USD)
- 14.07
- 3Cost per 100 mg 0.025
- Dose
- 500 mg
- Servings
- 120
- Price (USD)
- 14.95
- 4Cost per 100 mg 0.173
- Dose
- 550 mg
- Servings
- 15
- Price (USD)
- 14.24
- 5Cost per 100 mg 0.403
- Dose
- 153 mg
- Servings
- 60
- Price (USD)
- 36.99
- 6Cost per 100 mg 0.409
- Dose
- 160 mg
- Servings
- 22
- Price (USD)
- 14.39
- 7Cost per 100 mg 0.432
- Dose
- 259 mg
- Servings
- 25
- Price (USD)
- 27.99
- 8Cost per 100 mg 0.436
- Dose
- 153 mg
- Servings
- 30
- Price (USD)
- 19.99
- 9Cost per 100 mg 0.454
- Dose
- 160 mg
- Servings
- 45
- Price (USD)
- 32.69
- 10Cost per 100 mg 0.640
- Dose
- 640
- Servings
- 30
- Price (USD)
- 122.95
- 11Cost per 100 mg 0.667
- Dose
- 200 mg
- Servings
- 45
- Price (USD)
- 59.99
- 12Cost per 100 mg 0.699
- Dose
- 155 mg
- Servings
- 45
- Price (USD)
- 48.76
- 13Cost per 100 mg 0.711
- Dose
- 240 mg
- Servings
- 30
- Price (USD)
- 51.16
- 14Cost per 100 mg 0.776
- Dose
- 240 mg
- Servings
- 12
- Price (USD)
- 22.36
- 15Cost per 100 mg 1.000
- Dose
- 200 mg
- Servings
- 45
- Price (USD)
- 89.99
- 16Cost per 100 mg 2.67
- Dose
- 15 mg
- Servings
- 90
- Price (USD)
- 36.00
- 17Cost per 100 mg 10.54
- Dose
- 10 g
- Servings
- 45
- Price (USD)
- 47.41
- 18Cost per 100 mg 12.12
- Dose
- 10 g
- Servings
- 45
- Price (USD)
- 54.56
- 19Cost per 100 mg 30.82
- Dose
- 3 %
- Servings
- 30
- Price (USD)
- 29.59
- 20Cost per 100 mg 31.80
- Dose
- 4 g
- Servings
- 60
- Price (USD)
- 80.13
How we rank L-Serine
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.