Brand
21st Century
In our price lists, 21st Century shows up for 56 supplements – most often vitamin D, multivitamins and melatonin.
- Made by (label)
- 21st Century HealthCare, Inc., Tempe, AZ, USA (NIH)
- Website
- 21stcenturyvitamins.com
Logo from the brand’s own website, shown only to identify it. 21st Century doesn’t pay to be listed.
Our rating
Fair
Average quality score of 279 products
Its products by quality score
- 0 very good
- 229 good
- 14 fair
- 36 low
56
supplements in our price lists
75%
of other products cost more per dose – for a typical product
0%
of its products carry an independent testing seal
Full range
Every 21st Century product we checked
279 products in 56 supplements. The yellow tag is the cost for the same amount – and “#3 of 120” is its place in our price list, cheapest first.
$10.49#25 of 531
2.1¢per 25 µg#25 of 531
$10.49#26 of 531
2.1¢per 25 µg#26 of 531
$10.99#30 of 531
2.2¢per 25 µg#30 of 531
$10.99#31 of 531
2.2¢per 25 µg#31 of 531
$12.99#43 of 531
2.6¢per 25 µg#43 of 531
Sentry, Adults Multivitamin & Multimineral Supplement
300 tablets
30Low qualityvitacost.com (opens in a new tab)
$17.50#5 of 1,075
5.8¢per serving#5 of 1,075
$5.99#6 of 1,075
6¢per serving#6 of 1,075
Sentry Senior, Multivitamin & Multimineral Supplement, Adults 50+
265 tablets
30Low qualityvitacost.com (opens in a new tab)
$15.99#7 of 1,075
6¢per serving#7 of 1,075
Sentry Senior, Multivitamin & Multimineral Supplement, Adults 50+
125 tablets
30Low qualityvitacost.com (opens in a new tab)
$8.99#9 of 1,075
7.2¢per serving#9 of 1,075
Sentry, Adults Multivitamin & Multimineral Supplement
130 tablets
30Low qualityvitacost.com (opens in a new tab)
$9.89#11 of 1,075
7.6¢per serving#11 of 1,075
$8.99#22 of 326
1.5¢per 1 mg#22 of 326
$8.99#23 of 326
1.5¢per 1 mg#23 of 326
$8.99#24 of 326
1.5¢per 1 mg#24 of 326
$8.99#25 of 326
1.5¢per 1 mg#25 of 326
$5.49#44 of 326
2¢per 1 mg#44 of 326
$8.99#45 of 447
3.6¢per 500 mg#45 of 447
$9.26#49 of 447
3.7¢per 500 mg#49 of 447
$4.62#54 of 447
3.9¢per 500 mg#54 of 447
$8.99#61 of 447
4.1¢per 500 mg#61 of 447
$4.99#69 of 447
4.5¢per 500 mg#69 of 447
$39.99#58 of 376
$0.17per 100 mg#58 of 376
$39.99#59 of 376
$0.17per 100 mg#59 of 376
$33.99#76 of 376
$0.19per 100 mg#76 of 376
$33.99#77 of 376
$0.19per 100 mg#77 of 376
$19.99#101 of 376
$0.22per 100 mg#101 of 376
$12.99#16 of 220
$0.16per 1,500 mg#16 of 220
$12.99#17 of 220
$0.16per 1,500 mg#17 of 220
$6.99#54 of 220
$0.35per 1,500 mg#54 of 220
$6.99#55 of 220
$0.35per 1,500 mg#55 of 220
Glucosamine Chondroitin Complex Plus MSM, Advanced Triple Strength
120 tablets
23Low qualityvitacost.com (opens in a new tab)
$22.99#61 of 220
$0.38per 1,500 mg#61 of 220
$19.99#40 of 465
$0.13per 10 billion CFU#40 of 465
$20.99#42 of 465
$0.14per 10 billion CFU#42 of 465
$19.99#139 of 465
$0.33per 10 billion CFU#139 of 465
Kalos & Splendor Doo-dah Vaginal Probiotic
60 capsules
75Good quality21stcenturyvitamins.com (opens in a new tab)
$19.99#238 of 465
$0.67per 10 billion CFU#238 of 465
$22.99#258 of 465
$0.77per 10 billion CFU#258 of 465
$12.49#4 of 245
2.3¢per 1,000 µg#4 of 245
$12.49#5 of 245
2.3¢per 1,000 µg#5 of 245
$8.99#11 of 245
3.3¢per 1,000 µg#11 of 245
$8.99#12 of 245
3.3¢per 1,000 µg#12 of 245
$7.49#58 of 245
6.8¢per 1,000 µg#58 of 245
$17.99#12 of 134
4¢per 100 mg#12 of 134
$18.53#13 of 134
4.1¢per 100 mg#13 of 134
$10.99#18 of 134
4.4¢per 100 mg#18 of 134
$8.99#24 of 134
4.5¢per 100 mg#24 of 134
$9.26#30 of 134
4.7¢per 100 mg#30 of 134
$7.99#10 of 189
1.5¢per 1,000 µg#10 of 189
$8.79#11 of 189
1.6¢per 1,000 µg#11 of 189
$11.99#49 of 189
4¢per 1,000 µg#49 of 189
$4.99#62 of 189
5.7¢per 1,000 µg#62 of 189
$5.49#67 of 189
6.2¢per 1,000 µg#67 of 189
$7.49#2 of 293
7.5¢per serving#2 of 293
$7.49#3 of 293
7.5¢per serving#3 of 293
$6.49#18 of 293
9.8¢per serving#18 of 293
$6.49#24 of 293
$0.11per serving#24 of 293
$6.49#25 of 293
$0.11per serving#25 of 293
$7.99#3 of 627
2.6¢per 200 mg#3 of 627
$8.79#4 of 627
2.8¢per 200 mg#4 of 627
$4.99#6 of 627
3.6¢per 200 mg#6 of 627
$5.49#8 of 627
4¢per 200 mg#8 of 627
$14.99#124 of 627
$0.22per 200 mg#124 of 627
$4.99#2 of 108
3¢per 18 mg#2 of 108
$4.99#5 of 108
3.3¢per 18 mg#5 of 108
$4.99#6 of 108
3.3¢per 18 mg#6 of 108
$5.49#7 of 108
3.3¢per 18 mg#7 of 108
Iron 65mg
120 tablets
28Low qualityOver the upper limit per serving21stcenturyvitamins.com (opens in a new tab)
$5.49#93 of 108
1.3¢per 18 mg#93 of 108
$5.49#10 of 131
0.91¢per 400 µg#10 of 131
$5.49#11 of 131
0.91¢per 400 µg#11 of 131
$5.49#25 of 131
1.3¢per 400 µg#25 of 131
$5.49#26 of 131
1.3¢per 400 µg#26 of 131
$12.99#60 of 131
5.1¢per 400 µg#60 of 131
Niacin 500 mg
100 tablets
80Good qualityOver the upper limit per serving21stcenturyvitamins.com (opens in a new tab)
$8.99#37 of 117
0.45¢per 25 mg#37 of 117
Prolonged Release Niacin, 500 mg
100 tablets
80Good qualityOver the upper limit per servingvitacost.com (opens in a new tab)
$9.53#39 of 117
0.48¢per 25 mg#39 of 117
Niacin 250 mg
110 tablets
80Good qualityOver the upper limit per serving21stcenturyvitamins.com (opens in a new tab)
$5.49#40 of 117
0.5¢per 25 mg#40 of 117
Niacin, Prolonged Release
110 tablets
80Good qualityOver the upper limit per servingvitacost.com (opens in a new tab)
$6.04#45 of 117
0.55¢per 25 mg#45 of 117
Niacin Inositol Hexanicotinate
110 capsules
80Good qualityOver the upper limit per serving21stcenturyvitamins.com (opens in a new tab)
$13.99#68 of 117
0.79¢per 25 mg#68 of 117
Zinc Citrate, 50 mg
360 tablets
30Low qualityOver the upper limit per servingvitacost.com (opens in a new tab)
$8.49#116 of 202
0.47¢per 10 mg#116 of 202
Zinc Citrate 50 mg
360 tablets
30Low qualityOver the upper limit per serving21stcenturyvitamins.com (opens in a new tab)
$8.49#117 of 202
0.47¢per 10 mg#117 of 202
Zinc 50 mg
110 tablets
75Good qualityOver the upper limit per serving21stcenturyvitamins.com (opens in a new tab)
$4.49#120 of 202
0.82¢per 10 mg#120 of 202
Chelated Zinc, 50 mg
60 tablets
75Good qualityOver the upper limit per servingvitacost.com (opens in a new tab)
$3.00#123 of 202
1¢per 10 mg#123 of 202
Zinc Citrate, 50 mg
60 tablets
80Good qualityOver the upper limit per servingvitacost.com (opens in a new tab)
$3.00#124 of 202
1¢per 10 mg#124 of 202
$7.99#5 of 63
$0.11per 1,000 mg#5 of 63
$7.99#6 of 63
$0.11per 1,000 mg#6 of 63
$14.99#21 of 63
$0.23per 1,000 mg#21 of 63
$14.99#22 of 63
$0.23per 1,000 mg#22 of 63
$16.49#22 of 56
$0.21per 500 mg#22 of 56
$16.49#23 of 56
$0.21per 500 mg#23 of 56
$8.49#36 of 56
$0.35per 500 mg#36 of 56
$8.49#37 of 56
$0.35per 500 mg#37 of 56
Full Fuel 365, Creatine Monohydrate, Unflavored
454 g (1 lb) · Powder
80Good qualityvitacost.com (opens in a new tab)
$14.99#5 of 388
$0.17per 5 g#5 of 388
Full Fuel 365 Creatine Monohydrate Powder
450 g (1 lb) · Powder
80Good quality21stcenturyvitamins.com (opens in a new tab)
$14.99#6 of 388
$0.17per 5 g#6 of 388
Full Fuel 365, Creatine Monohydrate Gummies, Mixed Berry
75 gummies
80Good qualityvitacost.com (opens in a new tab)
$13.99#276 of 388
$0.93per 5 g#276 of 388
Full Fuel 365 Creatine Monohydrate Gummy
75 gummies
80Good quality21stcenturyvitamins.com (opens in a new tab)
$13.99#277 of 388
$0.93per 5 g#277 of 388
$10.49#29 of 64
$0.17per 1,000 mg#29 of 64
$10.99#31 of 64
$0.18per 1,000 mg#31 of 64
$7.49#41 of 64
$0.25per 1,000 mg#41 of 64
$7.49#42 of 64
$0.25per 1,000 mg#42 of 64
$16.49#35 of 78
$0.16per 120 mg#35 of 78
$16.98#38 of 78
$0.17per 120 mg#38 of 78
$8.49#57 of 78
$0.28per 120 mg#57 of 78
$9.34#60 of 78
$0.31per 120 mg#60 of 78
Kalos & Splendor Advanced Hair Skin & Nails
50 tablets
65Fair quality21stcenturyvitamins.com (opens in a new tab)
$7.49#3 of 161
$0.15per serving#3 of 161
$7.71#4 of 161
$0.15per serving#4 of 161
$9.99#32 of 161
$0.33per serving#32 of 161
Kalos & Splendor Hair Skin & Nails Extra Strength
90 tablets
65Fair quality21stcenturyvitamins.com (opens in a new tab)
$9.99#33 of 161
$0.33per serving#33 of 161
$12.99#44 of 110
$0.39per 3 g#44 of 110
$12.99#45 of 110
$0.39per 3 g#45 of 110
$11.99#48 of 110
$0.40per 3 g#48 of 110
$11.99#49 of 110
$0.40per 3 g#49 of 110
$15.99#56 of 102
$0.27per 300 mg#56 of 102
$15.99#57 of 102
$0.27per 300 mg#57 of 102
$7.99#75 of 102
$0.46per 300 mg#75 of 102
$7.99#76 of 102
$0.46per 300 mg#76 of 102
$21.99#3 of 21
$1.06per 1,000 mg#3 of 21
$21.99#4 of 21
$1.06per 1,000 mg#4 of 21
$13.99#6 of 21
$1.35per 1,000 mg#6 of 21
$13.99#7 of 21
$1.35per 1,000 mg#7 of 21
$16.99#91 of 640
$0.42per 1,000 mg#91 of 640
$7.49#334 of 640
$0.83per 1,000 mg#334 of 640
Norwegian Cod Liver Oil 400 mg
110 softgels
75Good quality21stcenturyvitamins.com (opens in a new tab)
$7.49#335 of 640
$0.83per 1,000 mg#335 of 640
$19.99#604 of 640
$4.50per 1,000 mg#604 of 640
$15.49#74 of 133
$0.39per 300 mg#74 of 133
$15.49#75 of 133
$0.39per 300 mg#75 of 133
$12.99#24 of 118
$0.26per 600 mg#24 of 118
$12.99#25 of 118
$0.26per 600 mg#25 of 118
$8.49#56 of 63
$0.28per 200 mg#56 of 63
$8.49#57 of 63
$0.28per 200 mg#57 of 63
$19.99#136 of 143
$1.81per 5 g#136 of 143
$19.99#137 of 143
$1.85per 5 g#137 of 143
$24.99#53 of 128
$0.42per 500 mg#53 of 128
$24.99#55 of 128
$0.42per 500 mg#55 of 128
$11.99#1 of 88
2.5¢per 500 mg#1 of 88
$4.99#8 of 88
5.5¢per 500 mg#8 of 88
$5.49#41 of 75
5.5¢per 200 µg#41 of 75
$6.04#45 of 75
6¢per 200 µg#45 of 75
$9.99#10 of 47
$0.17per 1,000 mg#10 of 47
$9.99#11 of 47
$0.17per 1,000 mg#11 of 47
Kalos & Splendor Collagen Peptides
300 g (10.6 oz) · Powder
80Good quality21stcenturyvitamins.com (opens in a new tab)
$14.99#6 of 197
$0.50per 10 g#6 of 197
Kalos & Splendor Collagen Peptides, Unflavored
300 g (10.6 oz) · Powder
85Good qualityvitacost.com (opens in a new tab)
$15.74#8 of 197
$0.52per 10 g#8 of 197
$7.49#13 of 245
$0.12per serving#13 of 245
$8.24#20 of 245
$0.14per serving#20 of 245
$7.99#36 of 45
$0.43per 400 mg#36 of 45
$8.39#37 of 45
$0.45per 400 mg#37 of 45
$8.49#13 of 39
7¢per 500 mg#13 of 39
$8.49#14 of 39
7¢per 500 mg#14 of 39
$7.99#22 of 89
$0.20per 600 mg#22 of 89
$7.99#23 of 89
$0.20per 600 mg#23 of 89
$8.49#26 of 34
$0.28per 100 mg#26 of 34
$8.49#27 of 34
$0.28per 100 mg#27 of 34
$8.49#7 of 16
$0.14per 300 mg#7 of 16
$8.49#8 of 16
$0.14per 300 mg#8 of 16
$6.99#15 of 78
7.8¢per 1,000 mg#15 of 78
$6.99#16 of 78
7.8¢per 1,000 mg#16 of 78
$15.99#38 of 79
$0.13per 10 mg#38 of 79
$15.99#40 of 79
$0.13per 10 mg#40 of 79
$10.99#42 of 69
$0.12per 1,000 mg#42 of 69
$12.09#49 of 69
$0.13per 1,000 mg#49 of 69
$4.99#33 of 84
4.6¢per 100 mg#33 of 84
$5.49#36 of 84
5¢per 100 mg#36 of 84
$5.49#32 of 78
4.6¢per 100 µg#32 of 78
$6.04#36 of 78
5¢per 100 µg#36 of 78
$7.99#3 of 12
$0.13per 50 mg#3 of 12
$7.99#4 of 12
$0.13per 50 mg#4 of 12
$5.99#22 of 73
1.8¢per 1,000 µg#22 of 73
$6.17#25 of 73
1.9¢per 1,000 µg#25 of 73
$9.99#71 of 187
1.7¢per 25 µg#71 of 187
Vitamin D3 125 mcg Plus K2 100 mcg
120 capsules
80Good qualityOver the upper limit per serving21stcenturyvitamins.com (opens in a new tab)
$9.99#72 of 187
1.7¢per 25 µg#72 of 187
$15.99#31 of 113
$0.15per 100 µg#31 of 113
$16.47#32 of 113
$0.15per 100 µg#32 of 113
Daily Greens Superfoods Powder, Lemon Lime
210 g (7.4 oz) · Powder
80Good qualityvitacost.com (opens in a new tab)
$26.24#65 of 209
$0.87per serving#65 of 209
$9.99#41 of 99
$0.40per 2 g#41 of 99
$12.49#5 of 92
9.9¢per 1,000 mg#5 of 92
$24.99#9 of 96
$0.42per 500 mg#9 of 96
$14.99#20 of 96
$0.35per 500 mg#20 of 96
$8.99#40 of 54
$0.37per 500 mg#40 of 54
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