Synergy K
Price
Retail
$37.80
Container
60 servings
Serving
1 Capsule
Brand Quality
Why this score
Testing practices
- Lot Tested
- Third-Party Lab Tested
- Transparent Batch-Specific COAs
- ISO 17025 Lab
Testing coverage
- Identity
- Purity
- Potency
- Heavy Metals
- Raw Ingredient Testing
Certifications
- NSF Certified
Manufacturing standards
- cGMP Certified
- Made in USA
Innovation
- Clinically Studied Product
Active Ingredients
- 25 mcg
Vitamin D(1,000 IU)
Ingredient research · Vitamin D
Vitamin D is a hormone-like nutrient that helps the body absorb calcium and maintain healthy bones and muscle function. Supplementation can reliably prevent or correct low vitamin D status, particularly when sun exposure is limited, while broader immune, cardiovascular, and metabolic benefits are less certain.
- Supports bone-density and fracture- or fall-related outcomes.
- Supports muscle-strength outcomes, including lower-limb strength.
- Supports glycemic-marker and insulin-sensitivity outcomes in studied metabolic populations.
- Supports respiratory-infection-risk outcomes across studied age groups.
Top References
- Effects of combined calcium and vitamin D supplementation on osteoporosis in postmenopausal women: a systematic review and meta-analysis of randomized controlled trials.
- 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
- Clinical review: The effect of vitamin D on falls: a systematic review and meta-analysis.
- Effect of Vitamin D Supplementation on Muscle Strength, Gait and Balance in Older Adults: A Systematic Review and Meta‐Analysis
- The effects of vitamin D on skeletal muscle strength, muscle mass, and muscle power: a systematic review and meta-analysis of randomized controlled trials.
- Effect of vitamin D supplementation on muscle strength: a systematic review and meta-analysis
- What is the impact of vitamin D supplementation on glycemic control in people with type-2 diabetes: a systematic review and meta-analysis of randomized controlled trails
- The Effect of Vitamin D Supplementation on Glycaemic Control in Women with Gestational Diabetes Mellitus: A Systematic Review and Meta-Analysis of Randomised Controlled Trials
- The Role of Vitamin D Oral Supplementation in Insulin Resistance in Women with Polycystic Ovary Syndrome: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
- Vitamin D supplementation to prevent acute respiratory infections: individual participant data meta-analysis.
- Vitamin D supplementation to prevent acute respiratory infections: a systematic review and meta-analysis of aggregate data from randomised controlled trials.
- Vitamin D and Respiratory Tract Infections: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
- 500 mcg
Vitamin K1
Ingredient research · Vitamin K1
Vitamin K1 is a fat-soluble essential vitamin that enables activation of proteins needed for normal blood clotting. Supplementation reliably prevents or corrects inadequate vitamin K status, particularly when intake or absorption is limited; although it also activates bone-related proteins, broader bone benefits from K1 supplements are less certain.
- Supports limiting progression of vascular calcification in adults receiving hemodialysis who already have cardiovascular calcification.
- 1000 mcg
Vitamin K2
Ingredient research · Vitamin K2
Vitamin K2 is a family of menaquinones that activates proteins involved in normal blood clotting, bone mineralization, and calcium regulation. Supplements are mainly used to support bone health, while possible benefits for vascular calcification and cardiovascular health remain less certain and may differ among forms such as MK-4 and MK-7.
- Supports selected osteocalcin carboxylation markers in postmenopausal osteoporosis.
- 45 mcg
Vitamin K2
Ingredient research · Vitamin K2
Vitamin K2 is a family of menaquinones that activates proteins involved in normal blood clotting, bone mineralization, and calcium regulation. Supplements are mainly used to support bone health, while possible benefits for vascular calcification and cardiovascular health remain less certain and may differ among forms such as MK-4 and MK-7.
- Supports selected osteocalcin carboxylation markers in postmenopausal osteoporosis.
Ranking
Inactive Ingredients
10 Ideal
- hypoallergenic Plant FiberIdeal
- Vegetarian CapsuleIdeal
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