Dr. Strum's Intensive Bone Formula

Dr. Strum's Intensive Bone Formula

Life Extension4.5 (181 ratings)
Format:Capsule Quantity: 300 Capsule(s) · 30 servings
Goals
$42.00 $1.40 per serving

Product analysis

63 out of 100

Dr. Strum’s Intensive Bone Formula combines calcium and magnesium with vitamins D and K to support bone nutrition. The serving is relatively costly when judged by several of its main nutrients.

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

Nutrient Quality66

Vitamin K, potassium and boron use favorable forms, while magnesium citrate offers reasonable absorption potential. Calcium’s earlier form information is favorable, but several other quality conclusions remain uncertain.

Ingredient Transparency80

All ingredient amounts and forms are stated. Only the proportions of the different boron sources remain undisclosed.

Value For Money32

Several main nutrients offer weak value at the full serving cost, despite reasonable potassium value. Earlier calcium and silicon comparisons also suggested a costly serving, though those prices may be outdated.

Customer Satisfaction69

Customer ratings are generally positive. The relatively small review count gives a limited picture of satisfaction.

Product Focus69

The clearest fit is bone and mineral nutrition, with wider benefits depending on nutritional need. The high vitamin D amount does not establish extra benefit or personal suitability.

Format
Capsule
Container
300 Capsule(s)
Per serving
$1.40
Customer rating
4.5 · 181 ratings
Report analysis

Goals

Impact
Highest effect
B+ Ingredient FitA+ PathwaysA+ EvidenceA+ Formulation Logic
Vitamin K · 200 mcgMagnesium · 400 mgCalcium · 800 mgVitamin D · 200 mcgBoron · 6 mgZinc · 10 mg
Study evidence
Boron Supportive 5 studies
Calcium Supportive 144 studies
Magnesium Supportive 48 studies
Potassium Supportive 39 studies
Silicon Supportive 13 studies
Vitamin D Supportive 202 studies
Vitamin K Supportive 78 studies
Zinc Supportive 33 studies
Impact
Highest effect
B- Ingredient FitB+ PathwaysA- EvidenceA+ Formulation Logic
Vitamin K · 200 mcgMagnesium · 400 mgVitamin D · 200 mcg
Study evidence
Magnesium Supportive 158 studies
Potassium Supportive 182 studies
Vitamin D Mixed 164 studies
Vitamin K Mixed 62 studies
Impact
Highest effect
B- Ingredient FitB+ PathwaysA- EvidenceA+ Formulation Logic
Vitamin K · 200 mcgPotassium · 1173 mgMagnesium · 400 mgVitamin D · 200 mcg
Study evidence
Magnesium Supportive 123 studies
Potassium Supportive 117 studies
Vitamin D Mixed 170 studies
Vitamin K Supportive 40 studies
Longevity
Impact
High effect
B- Ingredient FitF PathwaysA EvidenceA+ Formulation Logic
Magnesium · 400 mgVitamin K · 200 mcgVitamin D · 200 mcg
Study evidence
Boron Not classified

No linked studies yet.

Magnesium Supportive 12 studies
Vitamin D Supportive 50 studies
Vitamin K Supportive 27 studies
Zinc Supportive 10 studies
Impact
Highest effect
B Ingredient FitA+ PathwaysA- EvidenceA+ Formulation Logic
Vitamin D · 200 mcgMagnesium · 400 mgVitamin K · 200 mcgBoron · 6 mgZinc · 10 mg
Study evidence
Boron Supportive 6 studies
Magnesium Supportive 114 studies
Vitamin D Supportive 115 studies
Vitamin K Supportive 34 studies
Zinc Supportive 60 studies
Impact
High effect
C Ingredient FitB- PathwaysA EvidenceA+ Formulation Logic
Magnesium · 400 mgZinc · 10 mgVitamin D · 200 mcgBoron · 6 mg
Study evidence
Boron Disputed 3 studies
Magnesium Disputed 5 studies
Vitamin D Supportive 56 studies
Zinc Disputed 7 studies

Ingredients

IngredientAmount per servingScore
Vitamin D3 (Cholecalciferol)
200 mcg
Vitamin K2 (Menaquinone-7)
200 mcg 80
Calcium (Dicalcium Malate)
800 mg 70
Magnesium (Magnesium Citrate)
400 mg 66
Zinc (Zinc Citrate)
10 mg
Potassium (Potassium Citrate)
1173 mg 91
Winged Treebine extract (Ketosterones)
600 mg
Boron (Boron Aspartate, Boron Citrate, Boron Glycinate)
6 mg 72
Silicon (Bamboo extract)
5 mg 50
Adults 18–50
Report overview
A+ Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyB+ Value
Each serving lists 1173 mg of potassium. That is a substantial amount. The cost per serving is moderate. The source is potassium citrate. A serving is ten capsules.
How this ingredient is rated

Active Ingredient Quality & Bioavailability100

The source is potassium citrate.
Potassium Form Quality
The source is potassium citrate.

Dose, Safety & Label Transparency88

The potassium amount is listed as 1173 mg per serving, without explicit elemental-potassium wording.
Potassium Dosage Potency
Each serving lists 1173 mg of potassium. That is a substantial amount.
Elemental Yield Transparency
The potassium amount is listed as 1173 mg per serving, without explicit elemental-potassium wording.

Value80

The cost per serving is moderate.
Potassium Value Efficiency
The cost per serving is moderate.
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyF Value
Each serving provides 200 mcg of vitamin K at a high cost per serving. It uses trans-Menaquinone-7, a vitamin K2 form known as MK-7. The MK-7 is identified as the trans form.
How this ingredient is rated

Active Ingredient Quality & Bioavailability100

It uses trans-Menaquinone-7, a vitamin K2 form known as MK-7. The MK-7 is identified as the trans form.
Vitamin K Form (MK-7 vs. MK-4 vs. K1)
It uses trans-Menaquinone-7, a vitamin K2 form known as MK-7.
MK-7 Isomer Disclosure
The MK-7 is identified as the trans form.

Dose, Safety & Label Transparency100

The label states the vitamin K amount and identifies the trans-Menaquinone-7 form. Each serving provides 200 mcg of MK-7.
Vitamin K2 (MK-7) Dosage Efficacy
Each serving provides 200 mcg of MK-7.
Form and Subtype Transparency
The label states the vitamin K amount and identifies the trans-Menaquinone-7 form.

Value0

The cost per serving is high.
Price per Effective MK-7 Serving
The cost per serving is high.
D Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyF Value
+2
A serving provides 400 mg of magnesium at a high whole-serving cost, making it a costly way to obtain that amount. The magnesium comes from magnesium citrate. The serving also contains 800 mg of calcium.
How this ingredient is rated

Active Ingredient Quality & Bioavailability49

The magnesium comes from magnesium citrate. A specific branded chelation claim is not stated.
Magnesium Form & Absorption Potential
The magnesium comes from magnesium citrate.
Patented Materials & Chelation Quality
A specific branded chelation claim is not stated.

Dose, Safety & Label Transparency100

The serving provides 400 mg of elemental magnesium. The serving also contains 800 mg of calcium.
Elemental Yield Transparency
The label states 400 mg of elemental magnesium per serving.
Therapeutic Dosage Alignment
The serving provides 400 mg of elemental magnesium.
Synergistic Formulation Logic
The serving also contains 800 mg of calcium.

Value30

The whole serving costs more; its magnesium is magnesium citrate.
Price Per Elemental Quality
The whole serving costs more; its magnesium is magnesium citrate.
Report alternatives

Sources

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

  1. [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
  2. 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
  3. 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
  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. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. Association between Serum Magnesium and Fractures: A Systematic Review and Meta-Analysis of Observational Studies.
    Dominguez LJ; Veronese N; Ciriminna S; Pérez-Albela JL; Vásquez-López VF; Rodas-Regalado S; Di Bella G; Parisi A; Tagliaferri F; Barbagallo M · Nutrients · 2023
    Meta-analysis119,755 participants4 studies pooledBone Health forMagnesium
  12. Bioabsorbable Magnesium-Based Materials Potential and Safety in Bone Surgery: A Systematic Review.
    Hung CH; Kwok YC; Yip J; Wong HH; Leung YY · Craniomaxillofacial trauma & reconstruction · 2025
    Systematic review386 participants8 studies pooledBone Health forMagnesium
  13. Vascularized bone grafting fixed by biodegradable magnesium screw for treating osteonecrosis of the femoral head.
    Zhao D; Huang S; Lu F; Wang B; Yang L; Qin L; Yang K; Li Y; Li W; Wang W; Tian S; Zhang X; Gao W; Wang Z; Zhang Y; Xie X; Wang J; Li J · Biomaterials · 2016
    Randomized trial48 participantsBone Health forMagnesium
  14. An update on magnesium and bone health.
    Rondanelli M; Faliva MA; Tartara A; Gasparri C; Perna S; Infantino V; Riva A; Petrangolini G; Peroni G · Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine · 2022
    Narrative reviewBone Health forMagnesium
  15. Sex-specific differences in the association of magnesium intake with femoral neck bone mineral density among older adults.
    Wang B; Tan X; Yao X; Zhu Z · Endocrine connections · 2025
    Cross-sectional study1,343 participantsBone Health forMagnesium
  16. Effect of potassium citrate on bone density, microarchitecture, and fracture risk in healthy older adults without osteoporosis: a randomized controlled trial.
    Jehle S; Hulter HN; Krapf R · The Journal of clinical endocrinology and metabolism · 2013
    Randomized trial201 participantsBone Health forPotassium
  17. Long-term persistence of the urine calcium-lowering effect of potassium bicarbonate in postmenopausal women.
    Frassetto L; Morris RC; Sebastian A · The Journal of clinical endocrinology and metabolism · 2005
    Randomized trial170 participantsBone Health forPotassium
  18. Partial neutralization of the acidogenic Western diet with potassium citrate increases bone mass in postmenopausal women with osteopenia.
    Jehle S; Zanetti A; Muser J; Hulter HN; Krapf R · Journal of the American Society of Nephrology : JASN · 2007
    Randomized trial161 participantsBone Health forPotassium
  19. Potassium citrate supplementation results in sustained improvement in calcium balance in older men and women.
    Moseley KF; Weaver CM; Appel L; Sebastian A; Sellmeyer DE · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2013
    Randomized trial52 participantsBone Health forPotassium
  20. Effects of potassium chloride and potassium bicarbonate on endothelial function, cardiovascular risk factors, and bone turnover in mild hypertensives.
    He FJ; Marciniak M; Carney C; Markandu ND; Anand V; Fraser WD; Dalton RN; Kaski JC; MacGregor GA · Hypertension (Dallas, Tex. : 1979) · 2010
    Randomized trial42 participantsBone Health forPotassium