Table salt additives approved by the
U.S. Food and Drug Administration (FDA)^[1]

Additive

Chemical Formula

ƒ[2]

CFR Section

Concentration Limit

CAS No.

Ferric ammonium citrate, green
(iron ammonium citrate,
green ferric ammonium citrate)

a

172.430

25 ppm

Silicon dioxide

SIO₂

a

172.480

2%

Yellow prussiate of soda (YPS,
sodium ferrocyanide decahydrate)

Na₄Fe(CN)₆·10H₂O

a

172.490

13 ppm as anhydrous Na₄Fe(CN)₆

13601-19-9

Propylene glycol

C₃H₈O₂

a,h

184.1666

2%

57-55-6

Sodium bicarbonate

NaHCO₃

s

184.1736

GMP[3]

144-55-8

Sodium carbonate

Na₂CO₃

s

184.1742

GMP

497-19-8

Sodium thiosulfate

Na₂S₂O₃ · 5H2O

s

184.1807

0.1%

010102-17-7

Aluminum calcium silicate

a

182.2122

2%, GMP

Calcium silicate (calcium metasilicate)

CaSiO₃

f

182.2227

2%, GMP

1344-95-2

Magnesium silicate

MgSIO₃ ·5H₂O

f

182.2437

2%, GMP

Magnesium carbonate

MgCO₃ 

f

184.1425

GMP

546-93-0

Sodium aluminosilicate (Zeolex,
sodium silicoaluminate)

a

182.2727

2%

Dextrose (corn sugar, D-glucose)

C₆H₁₂O₆

s

184.1857

GMP (no limit, usually about 0.0374%)

50-99-7

Tricalcium silicate

a

182.2906

2%, GMP

Tricalcium phosphate

(calcium phosphate, tribasic)

Ca₃(PO4)₂ (true)

Ca₅OH(PO₃)₄

a,s

182.217

GMP

Potassium iodide

KI

I

184.1634

0.006-0.01%
Max. 0.01%

7681-11-0

Cuprous iodide

CuI

I

184.1265

Max. 0.01%

7681-65-4

Polysorbate 80 (polyoxyethylene (20) Sorbitan Monooleate)

sur

172.840

Max 10 ppm in NaCl (coarse crystal production)