Sentry Adults

Sentry Adults

21st Century4.7 (26,118 ratings)
Format:Tablet Quantity: 300 Tablet(s) · 300 servings
Goals
$16.99 $0.05 per serving

Product analysis

58 out of 100

Sentry Adults offers inexpensive nutritional coverage for normal energy use and immune function when dietary intake is low.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality40

Mineral quality varies, with favorable iodine and molybdenum forms alongside less favorable copper and selenium forms. Many other ingredients lack a confirmed quality comparison.

Ingredient Transparency78

Amounts and nearly all forms are stated, making most contents easy to identify. The proportions of the vitamin A and calcium mixtures are missing.

Value For Money53

The serving is inexpensive, with favorable cost comparisons for several minerals. Value for many other nutrients remains uncertain.

Customer Satisfaction91

Customer feedback is very positive across tens of thousands of ratings. The large review base provides a broad picture of satisfaction without proving an energy or hair benefit.

Product Focus39

The extensive nutrient lineup fits general dietary support. Benefits for tiredness, hair and concentration mainly depend on low nutrient intake being part of the problem.

Format
Tablet
Container
300 Tablet(s)
Per serving
$0.05
Customer rating
4.7 · 26,118 ratings
Report analysis

Goals

Immunity
Impact
High effect
C- Ingredient FitA+ PathwaysA+ EvidenceA+ Formulation Logic
Magnesium · 50 mgVitamin C · 60 mgZinc · 11 mgVitamin A · 1050 mcgVitamin D · 25 mcgSelenium · 55 mcg
Study evidence
Iron Supportive 23 studies
Magnesium Supportive 8 studies
Selenium Mixed 37 studies
Vitamin A Supportive 107 studies
Vitamin C Supportive 53 studies
Vitamin D Supportive 85 studies
Vitamin E Supportive 21 studies
Zinc Supportive 73 studies
Everyday Health
Impact
Highest effect
B+ Ingredient FitA+ PathwaysB+ EvidenceA+ Formulation Logic
Folate · 667 mcg DFEVitamin B12 · 6 mcgVitamin D · 25 mcgMagnesium · 50 mgVitamin K · 25 mcgSelenium · 55 mcgZinc · 11 mgVitamin C · 60 mg
Study evidence
Folate Supportive 80 studies
Magnesium Supportive 114 studies
Selenium Supportive 70 studies
Vitamin C Supportive 56 studies
Vitamin D Supportive 115 studies
Vitamin K Supportive 34 studies
Zinc Supportive 60 studies
Hair Health
Impact
Moderate effect
C- Ingredient FitF PathwaysA+ EvidenceA+ Formulation Logic
Biotin · 30 mcgVitamin D · 25 mcgZinc · 11 mgIron · 18 mgVitamin C · 60 mg
Study evidence
Biotin Supportive 4 studies
Copper Adverse 4 studies
Folate Mixed 15 studies
Iodine No effect 1 study
Iron Disputed 25 studies
Niacin Disputed 2 studies
Selenium Disputed 7 studies
Vitamin A Disputed 13 studies
Vitamin D Disputed 34 studies
Vitamin E No effect 3 studies
Zinc Supportive 22 studies
Impact
Moderate effect
C Ingredient FitF PathwaysA+ EvidenceA+ Formulation Logic
Iodine · 150 mcgVitamin D · 25 mcgVitamin B5 · 10 mgMagnesium · 50 mgRiboflavin · 1.7 mgThiamin · 1.5 mgVitamin B12 · 6 mcgIron · 18 mgPotassium · 80 mg
Study evidence
Iodine Adverse 3 studies
Iron Supportive 74 studies
Magnesium Supportive 4 studies
Potassium Supportive 2 studies
Thiamin Disputed 12 studies
Vitamin D Supportive 32 studies
Productivity Boost
Impact
Moderate effect
F Ingredient FitF PathwaysA EvidenceA+ Formulation Logic
Iron · 18 mgVitamin B12 · 6 mcgVitamin B12 · 6 mcgVitamin B6 · 2 mgZinc · 11 mgMagnesium · 50 mg
Study evidence
Iron Supportive 69 studies
Magnesium Supportive 10 studies
Zinc Supportive 11 studies

Ingredients

IngredientAmount per servingScore
Vitamin A (Beta-Carotene, Vitamin A Acetate)
1050 mcg
Vitamin C (Ascorbic Acid)
60 mg
Vitamin D3 (Cholecalciferol)
25 mcg
Vitamin E (DL-Alpha-Tocopheryl Acetate)
13.5 mg
Vitamin K (Phytonadione)
25 mcg
Thiamine (Thiamine Mononitrate)
1.5 mg
Riboflavin
1.7 mg
Niacin (Niacinamide)
20 mg
Vitamin B6 (Pyridoxine Hydrochloride)
2 mg
Folate
667 mcg DFE
Vitamin B12 (Cyanocobalamin)
6 mcg
Biotin
30 mcg
Pantothenic Acid (D-Calcium Pantothenate)
10 mg
Calcium (Calcium Carbonate, Dicalcium Phosphate)
200 mg
Iron (Ferrous Fumarate)
18 mg 73
Phosphorus (Dicalcium Phosphate)
20 mg
Iodine (Potassium Iodide)
150 mcg 100
Magnesium (Magnesium Oxide)
50 mg
Zinc (Zinc Oxide)
11 mg
Selenium (Sodium Selenate)
55 mcg 57
Copper (Copper Sulfate)
0.5 mg 46
Manganese (Manganese Sulfate)
2.3 mg 70
Chromium (Chromium Picolinate)
35 mcg
Molybdenum (Sodium Molybdate)
45 mcg 64
Chloride (Potassium Chloride)
72 mg 81
Potassium (Potassium Chloride)
80 mg
Gluten Free Adults 18–50
Report overview
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value
The serving provides 150 mcg of iodine at a low cost per serving. The iodine comes from potassium iodide. The stated iodine amount supports daily intake.
How this ingredient is rated

Active Ingredient Quality & Bioavailability100

The iodine comes from potassium iodide. No marine iodine source is indicated, so marine sourcing concerns do not apply.
Iodine Form & Bioavailability
The iodine comes from potassium iodide.
Marine Source Purity & Sourcing
No marine iodine source is indicated, so marine sourcing concerns do not apply.

Dose, Safety & Label Transparency100

It provides 150 mcg of iodine per serving for daily support. The source is also stated.
Dosage Efficacy for Daily Support
It provides 150 mcg of iodine per serving for daily support.
Dosage Safety & Upper Limits
The 150 mcg serving is below the stated adult upper intake level.
Elemental Iodine Transparency
The iodine amount and source are stated.

Value100

The cost per serving is low.
Price Per Effective Serving
The cost per serving is low.
B+ Active Ingredient Quality & BioavailabilityB- Dose, Safety & Label TransparencyA+ Value
The serving provides 72 mg of chloride, a moderate amount, at a low cost per serving. The chloride comes from potassium chloride.
How this ingredient is rated

Active Ingredient Quality & Bioavailability80

The chloride comes from potassium chloride.
Chloride source quality
The chloride comes from potassium chloride.

Dose, Safety & Label Transparency72

The label lists 72 mg of chloride per serving, a moderate amount. It also names the salt source.
Chloride amount per serving
72 mg of chloride per serving is a moderate amount.
Amount and source disclosure
The label lists both the chloride amount and its salt source.

Value100

The cost per serving is low.
Price per serving
The cost per serving is low.
F Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value
The serving provides 18 mg iron at a low cost per serving. The iron comes from ferrous fumarate. Its zinc may compete with iron absorption.
How this ingredient is rated

Active Ingredient Quality & Bioavailability31

The iron comes from ferrous fumarate. Zinc is also present and can compete with iron absorption. It also includes 60 mg vitamin C, B12 and folate.
Iron Chemical Form & Bioavailability
The iron comes from ferrous fumarate.
Absorption Support & Blocker Avoidance
Zinc is also present and can compete with iron absorption. It also includes 60 mg vitamin C, B12 and folate.

Dose, Safety & Label Transparency100

The label states 18 mg elemental iron per serving.
Elemental Iron Label Clarity
The label states 18 mg elemental iron per serving.
Dosage Effectiveness & Safety Range
The serving provides 18 mg iron.

Value100

The cost per serving is low.
Price per Effective Serving
The cost per serving is low.
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Association of radioactive iodine treatment with survivorship symptoms and primary care utilisation in women of reproductive age with thyroid cancer: a retrospective cohort study.
    Devanarayan P; Hartman M; Partin M · Family medicine and community health · 2026
    Cohort study10,882 participantsEnergy forIodine
  2. Energy level and fatigue after surgery for thyroid cancer: A population-based study of patient-reported outcomes.
    Hughes DT; Reyes-Gastelum D; Kovatch KJ; Hamilton AS; Ward KC; Haymart MR · Surgery · 2020
    Cohort study2,584 participantsEnergy forIodine
  3. Health-Related Quality of Life in Differentiated Thyroid Cancer Survivors: A Cross-Sectional Study From Turkey.
    Gültekin A; Kahraman MY; Şengöz T; Şimşek FS · Head & neck · 2026
    Cross-sectional study202 participantsEnergy forIodine
  4. Large-dose intravenous ferric carboxymaltose injection for iron deficiency anemia in heavy uterine bleeding: a randomized, controlled trial.
    Van Wyck DB; Mangione A; Morrison J; Hadley PE; Jehle JA; Goodnough LT · Transfusion · 2010
    Randomized trial477 participantsEnergy forIron
  5. The Effect of Parenteral or Oral Iron Supplementation on Fatigue, Sleep, Quality of Life and Restless Legs Syndrome in Iron-Deficient Blood Donors: A Secondary Analysis of the IronWoMan RCT.
    Macher S; Herster C; Holter M; Moritz M; Matzhold EM; Stojakovic T; Pieber TR; Schlenke P; Drexler C; Amrein K · Nutrients · 2021
    Randomized trial176 participantsEnergy forIron
  6. Ferric carboxymaltose vs. oral iron in the treatment of pregnant women with iron deficiency anemia: an international, open-label, randomized controlled trial (FER-ASAP).
    Breymann C; Milman N; Mezzacasa A; Bernard R; Dudenhausen J; FER-ASAP investigators · Journal of perinatal medicine · 2018
    Randomized trial252 participantsEnergy forIron
  7. Effect of iron therapy on fatigue symptoms in non-anaemic iron deficient women of reproductive age- A Randomized Controlled Trial.
    Sultana N; Bajwa FA; Sikandar MZ; Haider MM; Majeed T · JPMA. The Journal of the Pakistan Medical Association · 2026
    Randomized trial164 participantsEnergy forIron
  8. Intravenous iron isomaltoside treatment of women suffering from severe fatigue after postpartum hemorrhage.
    Holm C; Thomsen LL; Langhoff-Roos J · The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians · 2019
    Randomized trial85 participantsEnergy forIron
  9. Magnesium-L-threonate improves sleep quality and daytime functioning in adults with self-reported sleep problems: A randomized controlled trial.
    Hausenblas HA; Lynch T; Hooper S; Shrestha A; Rosendale D; Gu J · Sleep medicine: X · 2025
    Randomized trial80 participantsEnergy forMagnesium
  10. Total magnesium intake and risk of frailty in older women.
    Struijk EA; Fung TT; Bischoff-Ferrari HA; Willett WC; Lopez-Garcia E · Journal of cachexia, sarcopenia and muscle · 2024
    Cohort study81,524 participantsEnergy forMagnesium
  11. Red blood cell magnesium and chronic fatigue syndrome.
    Cox IM; Campbell MJ; Dowson D · Lancet (London, England) · 1991
    Randomized trial32 participantsEnergy forMagnesium
  12. Exercise, magnesium and immune function.
    Laires MJ; Monteiro C · Magnesium research · 2008
    Narrative reviewEnergy forMagnesium
  13. [Efficacy of potassium N-acetylaminosuccinate (Cogitum) in the treatment of asthenic syndrome: results of double-blind placebo-controlled trial].
    Esin RG; Khayrullin IK; Esin OR; Fatykhova AF; Gismatullina EI; Isaeva YN · Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova · 2023
    Randomized trial37 participantsEnergy forPotassium
  14. Human resting energy expenditure in relation to dietary potassium.
    Dériaz O; Thériault G; Lavallée N; Fournier G; Nadeau A; Bouchard C · The American journal of clinical nutrition · 1991
    Randomized trial8 participantsEnergy forPotassium
  15. Physicochemical properties of and volatile compounds in riboflavin fortified cloudy apple juice; study of its effect on job fatigue among Egyptian construction workers.
    Fouad S; Ibrahim GE; Hussein AMS; Ibrahim FA; El Gendy A · Heliyon · 2021
    Non-randomized trialEnergy forRiboflavin
  16. Vitamin B status in patients with chronic fatigue syndrome.
    Heap LC; Peters TJ; Wessely S · Journal of the Royal Society of Medicine · 1999
    Case-control study30 participantsEnergy forRiboflavin
  17. B-vitamins, related vitamers, and metabolites in patients with quiescent inflammatory bowel disease and chronic fatigue treated with high dose oral thiamine.
    Bager P; Hvas CL; Hansen MM; Ueland P; Dahlerup JF · Molecular medicine (Cambridge, Mass.) · 2023
    Observational studyEnergy forRiboflavin
  18. Metabolic features of chronic fatigue syndrome.
    Naviaux RK; Naviaux JC; Li K; Bright AT; Alaynick WA; Wang L; Baxter A; Nathan N; Anderson W; Gordon E · Proceedings of the National Academy of Sciences of the United States of America · 2024
    Case-control study84 participantsEnergy forRiboflavin
  19. Effectiveness of Riboflavin in Inherited Metabolic Diseases: A Systematic Review
    Bregje Jaeger, Nina N Stolwijk, Femke Aaldering, Charlotte A Ruys, Marije Smits, Nicole I Wolf, Carla E M Hollak, Annet M Bosch · Journal of Inherited Metabolic Disease · 2026
    Systematic review381 studies pooledEnergy forRiboflavin
  20. Influence of thiamin supplementation on the health and general well-being of an elderly Irish population with marginal thiamin deficiency.
    Smidt LJ; Cremin FM; Grivetti LE; Clifford AJ · Journal of gerontology · 1991
    Randomized trial80 participantsEnergy forThiamin