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Silica Complex

NOW
4.6
★ ★ ★ ★ ★
(259 ratings)
Manganese 2 mg
Horsetail 575 mg
Boron 1 mg
Product Image
Score80
A large horsetail extract and chelated trace minerals offer an economical silica-oriented formula. The absent silica yield and unclear value of bentonite make results difficult to predict.
How scoring works
Quantity:180 Tablet(s) • (180 servings)
Goals:
Nail Health
Hair Health
Bone Health

Score 80

A large horsetail extract and chelated trace minerals offer an economical silica-oriented formula. The absent silica yield and unclear value of bentonite make results difficult to predict.
How scoring works
$19.10($0.10 per serving)
Vitacost
$ 22.07
Pure Formulas
$ 19.95
Daily Vita
$ 19.10
Report prices

Analysis

Horsetail extract is supplied at 575 mg, a substantial labeled amount for a one-tablet serving. The label does not state the botanical species, plant part, extraction ratio, or silica yield, so the active silicon contribution remains unknown.

Zinc and manganese use amino-acid chelates, while boron and calcium provide smaller supporting amounts. These minerals can contribute to normal connective-tissue and bone processes, but the formula lacks the broader nutrient depth expected from a complete bone product.

The low serving cost and single-tablet format are practical strengths. Bentonite adds uncertain nutritional value and could complicate absorption timing, making the product best suited to users specifically comfortable with an unstandardized horsetail formula.

Who is it for
  • Adults seeking an inexpensive horsetail-based supplement
  • People focused on brittle hair or nails rather than regrowth
  • Users who prefer one tablet daily
Best for
  • Silica-oriented connective-tissue support
  • Trace-mineral supplementation
  • Hair and nail brittleness support

Pros

  • Provides 575 mg horsetail extract
  • Uses chelated zinc and manganese
  • Requires only one tablet per serving
  • Offers favorable serving value

Cons

  • Does not disclose the silica yield
  • Horsetail species and plant part are unspecified
  • Boron is lightly dosed
  • Bentonite has unclear nutritional value

Warnings

  • Bentonite can bind medicines or other supplements in the digestive tract, so separating doses is prudent.
  • The product cannot be used to track silica intake because no silica yield is provided.
  • Horsetail products can add diuretic effects; users taking diuretics or managing fluid balance should review regular use with a clinician.

Nutrient quality

84 Highest impact

Calcium citrate and mineral chelates are useful forms, while the horsetail extract lacks species and silica standardization, and the horsetail extract amount is substantial, manganese supports maintenance, and boron remains modest. The listed mineral and botanical amounts are not obviously excessive, while horsetail, calcium, zinc, manganese, and boron form a coherent hair, nail, and bone-support blend.

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Ingredient transparency

78 High impact

Every listed active ingredient has a specific amount, and no proprietary blend hides the amount of a listed active ingredient. Serving count is supplied, but complete daily-use directions are not provided, while inactive ingredients and excipients are not included in the supplied label details.

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Customer satisfaction

68 High impact

The supplied average rating is favorable but below the strongest products in this group, and the limited review count reduces confidence in the average rating. Specific review themes are unavailable, so repeated negatives and real-world fit remain uncertain.

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Value for money

88 Highest impact

A coherent formula supports fair value despite some dose or form limitations, and the very low serving cost provides excellent practical value. Bentonite contributes little compared with the core horsetail and mineral ingredients, while the formula and serving value compare well with similar products.

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Report analysis

Goals

Nail Health
Impact
Moderate effect
C+ Goal FitD Strength of SupportC- CoverageC+ Formula Quality
Horsetail · 575 mg

Horsetail can provide silica for nail-plate structure, while zinc and manganese support growth-related enzymes. The actual silica contribution cannot be determined from the extract weight.

The label omits horsetail species, plant part, and silica standardization. Chelated minerals are useful, but bentonite and boron add little clear value for brittle nails.

Study evidence
Horsetail Not classified

No linked studies yet.

Zinc No effect 1 study
Hair Health
Impact
Moderate effect
C- Goal FitD+ Strength of SupportC- CoverageC+ Formula Quality
Zinc · 5 mg

Horsetail may supply silica for hair strength, while chelated zinc and manganese add follicle-related cofactors. The formula is aimed more at brittleness than at proven hair regrowth.

The horsetail amount is large, but no silica percentage or extraction standard is given. Bentonite and minor minerals add complexity without resolving the uncertainty around active silicon exposure.

Study evidence
Horsetail Not classified

No linked studies yet.

Zinc Supportive 22 studies
Bone Health
Impact
Moderate effect
D Goal FitD Strength of SupportC- CoverageC+ Formula Quality
Calcium · 50 mgManganese · 2 mgBoron · 1 mgZinc · 5 mg

Horsetail extract and several trace minerals may support connective tissue and bone mineral metabolism. The formula provides little calcium and no vitamin D or vitamin K.

Chelated zinc, manganese, and boron are useful form choices, but their amounts are mostly modest. Missing silica standardization makes the contribution from horsetail uncertain.

Study evidence
Boron Supportive 5 studies
Calcium Supportive 144 studies
Horsetail Not classified

No linked studies yet.

Manganese Adverse 12 studies
Zinc Supportive 33 studies

Ingredients

IngredientAmount per serving
Calcium (Calcium Citrate)
50 mg
Zinc (Zinc Amino Acid Chelate)
5 mg
Manganese (Manganese Amino Acid Chelate)
2 mg
Horsetail extract
575 mg
Bentonite mineral powder
10 mg
Boron (Boron Amino Acid Chelate)
1 mg
Gluten Free Adults 18–50 Vegan Dairy Free Vegetarian
Report overview
A+ Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyA+ Value

The amino acid chelate is a strong form choice for absorption. The clearly disclosed amount supports nutritional maintenance but is below the targeted bone and joint range. Its very low serving cost makes it attractive for users who want a broader silica-focused formula with modest manganese.

Horsetail · 575 mg OverallScore52
F Active Ingredient Quality & BioavailabilityD Dose, Safety & Label TransparencyA+ Value

The substantial horsetail extract amount is fully disclosed, but the label gives no silica standardization or active mineral yield. A pressed tablet is less favorable for rapid release than a capsule or liquid, and the botanical species and plant part remain unidentified. Low serving cost provides good value for an unstandardized extract, though its actual silica contribution cannot be verified.

D- Active Ingredient Quality & BioavailabilityD+ Dose, Safety & Label TransparencyC Value

The amino acid chelate is not described well enough to confirm a high-quality boron form. Its low dose is unlikely to serve as a primary boron supplement. The inexpensive serving partly offsets that limitation for people choosing it mainly for the broader mineral and silica blend.

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Sources

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

  1. The Manganese-Bone Connection: Investigating the Role of Manganese in Bone Health.
    Taskozhina G; Batyrova G; Umarova G; Issanguzhina Z; Kereyeva N · Journal of clinical medicine · 2024
    Narrative reviewBone Health forManganese
  2. Correlation between bone mineral density and serum trace element contents of elderly males in Beijing urban area.
    Wang L; Yu H; Yang G; Zhang Y; Wang W; Su T; Ma W; Yang F; Chen L; He L; Ma Y; Zhang Y · International journal of clinical and experimental medicine · 2016
    Cross-sectional study91 participantsBone Health forManganese
  3. Effect of dietary boron on mineral, estrogen, and testosterone metabolism in postmenopausal women.
    Nielsen FH; Hunt CD; Mullen LM; Hunt JR · FASEB journal : official publication of the Federation of American Societies for Experimental Biology · 1987
    Single-arm trial12 participantsBone Health forBoron
  4. Effects of boron supplementation on bone mineral density and dietary, blood, and urinary calcium, phosphorus, magnesium, and boron in female athletes.
    Meacham SL; Taper LJ; Volpe SL · Environmental health perspectives · 1995
    Randomized trial28 participantsBone Health forBoron
  5. [Comparative study of the urinary excretion of boron, calcium, magnesium and phosphorus in postmenopausal women with and without osteoporosis].
    José Ramón V; Mora Mora M; Marino Alarcón O; Hernández G; Josefina Linares L; Urdaneta Romero H; Arévalo González E · Investigacion clinica · 2013
    Case-control study45 participantsBone Health forBoron
  6. The relationship between boron and magnesium status and bone mineral density in the human: a review.
    Volpe SL; Taper LJ; Meacham S · Magnesium research · 1994
    Narrative reviewBone Health forBoron
  7. Metabolic responses of postmenopausal women to supplemental dietary boron and aluminum during usual and low magnesium intake: boron, calcium, and magnesium absorption and retention and blood mineral concentrations
    C D Hunt, J L Herbel, F H Nielsen · The American Journal of Clinical Nutrition · 1997
    Non-randomized trial11 participantsBone Health forBoron
  8. What is the impact of daily oral supplementation of vitamin D3 (cholecalciferol) plus calcium on the incidence of hip fracture in older people? A systematic review and meta-analysis.
    Manoj P; Derwin R; George S · International journal of older people nursing · 2023
    Meta-analysis12,620 participants7 studies pooledBone Health forCalcium
  9. Calcium supplementation prevents seasonal bone loss and changes in biochemical markers of bone turnover in elderly New England women: a randomized placebo-controlled trial.
    Storm D; Eslin R; Porter ES; Musgrave K; Vereault D; Patton C; Kessenich C; Mohan S; Chen T; Holick MF; Rosen CJ · The Journal of clinical endocrinology and metabolism · 1998
    Randomized trial60 participantsBone Health forCalcium
  10. The effects of calcium supplementation (milk powder or tablets) and exercise on bone density in postmenopausal women.
    Prince R; Devine A; Dick I; Criddle A; Kerr D; Kent N; Price R; Randell A · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 1995
    Randomized trial168 participantsBone Health forCalcium
  11. The efficacy of calcium supplementation alone in elderly Thai women over a 2-year period: a randomized controlled trial.
    Rajatanavin R; Chailurkit L; Saetung S; Thakkinstian A; Nimitphong H · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2014
    Randomized trial404 participantsBone Health forCalcium
  12. Calcium-enriched foods and bone mass growth in prepubertal girls: a randomized, double-blind, placebo-controlled trial.
    Bonjour JP; Carrie AL; Ferrari S; Clavien H; Slosman D; Theintz G; Rizzoli R · The Journal of clinical investigation · 1997
    Randomized trial149 participantsBone Health forCalcium
  13. Risk of Environmental Chemicals on Bone Fractures Is Independent of Low Bone Mass in US Adults: Insights from 2017 to 2018 NHANES.
    Ling R; Ai Y; Chen C; Zhang J; Zou Z; Cheng S; Li C; Li X; Wang B · Metabolites · 2023
    Cross-sectional study2,640 participantsBone Health forManganese
  14. Associations of multiple metals with bone mineral density: A population-based study in US adults.
    Wei MH; Cui Y; Zhou HL; Song WJ; Di DS; Zhang RY; Huang Q; Liu JA; Wang Q · Chemosphere · 2021
    Cross-sectional studyBone Health forManganese
  15. Sex-specific associations of urinary mixed-metal concentrations with femoral bone mineral density among older people: an NHANES (2017-2020) analysis.
    Li H; Li G; Yi M; Zhou J; Deng Y; Huang Y; He S; Meng X; Liu L · Frontiers in public health · 2024
    Cross-sectional study31 participantsBone Health forManganese
  16. Relationship between blood manganese and bone mineral density and bone mineral content in adults: A population-based cross-sectional study.
    Wang C; Zhu Y; Long H; Ou M; Zhao S · PloS one · 2022
    Cross-sectional study9,732 participantsBone Health forManganese
  17. Increased incidence of fractures in middle-aged and elderly men with low intakes of phosphorus and zinc.
    Elmståhl S; Gullberg B; Janzon L; Johnell O; Elmståhl B · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 1999
    Cohort study6,576 participantsBone Health forZinc
  18. Zinc Supplementation Increases Procollagen Type 1 Amino-Terminal Propeptide in Premenarcheal Girls: A Randomized Controlled Trial.
    Berger PK; Pollock NK; Laing EM; Chertin V; Bernard PJ; Grider A; Shapses SA; Ding KH; Isales CM; Lewis RD · The Journal of nutrition · 2016
    Randomized trial147 participantsBone Health forZinc
  19. Randomized controlled trial of prenatal zinc supplementation and fetal bone growth.
    Merialdi M; Caulfield LE; Zavaleta N; Figueroa A; Costigan KA; Dominici F; Dipietro JA · The American journal of clinical nutrition · 2004
    Randomized trial242 participantsBone Health forZinc
  20. The effects of zinc supplementation on serum zinc, alkaline phosphatase activity and fracture healing of bones.
    Sadighi A; Roshan MM; Moradi A; Ostadrahimi A · Saudi medical journal · 2009
    Randomized trial60 participantsBone Health forZinc
  21. Is Zinc an Important Trace Element on Bone-Related Diseases and Complications? A Meta-analysis and Systematic Review from Serum Level, Dietary Intake, and Supplementation Aspects.
    Ceylan MN; Akdas S; Yazihan N · Biological trace element research · 2021
    Meta-analysis40 studies pooledBone Health forZinc
  22. The effects of minoxidil, 1% pyrithione zinc and a combination of both on hair density: a randomized controlled trial.
    Berger RS; Fu JL; Smiles KA; Turner CB; Schnell BM; Werchowski KM; Lammers KM · The British journal of dermatology · 2003
    Randomized trial200 participantsHair Health forZinc
  23. Incubatory environment of the scalp impacts pre-emergent hair to affect post-emergent hair cuticle integrity.
    Schwartz JR; Henry JP; Kerr KM; Flagler MJ; Page SH; Redman-Furey N · Journal of cosmetic dermatology · 2018
    Randomized trialHair Health forZinc
  24. A comparison of hair quality and cosmetic acceptance following the use of two anti-dandruff shampoos.
    Draelos ZD; Kenneally DC; Hodges LT; Billhimer W; Copas M; Margraf C · The journal of investigative dermatology. Symposium proceedings · 2006
    Randomized trial40 participantsHair Health forZinc
  25. BMI and levels of zinc, copper in hair, serum and urine of Turkish male patients with androgenetic alopecia.
    Ozturk P; Kurutas E; Ataseven A; Dokur N; Gumusalan Y; Gorur A; Tamer L; Inaloz S · Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) · 2015
    Case-control study216 participantsHair Health forZinc
  26. Analysis of serum zinc and copper concentrations in hair loss.
    Kil MS; Kim CW; Kim SS · Annals of dermatology · 2013
    Case-control study342 participantsHair Health forZinc
  27. Vitamins and minerals: their role in nail health and disease.
    Scheinfeld N; Dahdah MJ; Scher R · Journal of drugs in dermatology : JDD · 2007
    Narrative reviewNail Health forZinc