The short answer · Respiratory infection incidence

Micro Ingredients, Vitamin D3 + K2, 300 Softgels
4.9· 2,088 ratings· $0.09/serving
Vitamin D3 (Cholecalciferol) 5000 IU — higher than the studied 400-4000 IU window
Of 5,986 products scored for Respiratory infection incidence, Micro Ingredients, Vitamin D3 + K2, 300 Softgels ranks #1 with a DoseRank score of 87. Vitamin D3 (Cholecalciferol) is the strongest evidence signal for this outcome.
Vitamin D3 (Cholecalciferol) is the strongest evidence signal for this outcome.
Strong evidence · 5000 IU
The form made by skin on sun exposure and used in most supplements; converts to active calcitriol and raises serum 25(OH)D more effectively than D2.
Strong evidence · 5000 IU
Fat-soluble vitamin made in skin from sunlight; needed for calcium absorption, bone health, and immune modulation, and widely deficient in low-sun regions.
Moderate evidence · 2000000000 CFU
Widely studied probiotic species; the GG strain has evidence for preventing antibiotic-associated diarrhea and supporting gut barrier integrity.
Questions
Micro Ingredients, Vitamin D3 + K2, 300 Softgels ranks #1 for Respiratory infection incidence with a DoseRank score of 87. The score blends clinical strength, evidence, dose fit, trust signals and value across 5,986 products scored for this outcome.
Vitamin D3 (Cholecalciferol) is the strongest evidence signal for this outcome.
Vitamin D3 (Cholecalciferol) at 5000 IU is higher than the studied 400-4000 IU window. DoseRank scores this product's dose fit at 91 out of 100.
Micro Ingredients, Vitamin D3 + K2, 300 Softgels works out at $0.09 per serving. $0.09 per serving — low price tier for this outcome. The cheapest ranked pick here is $0.08 per serving.
No. Retailer links may be affiliate links, but rankings and placement are never paid. Every product is scored by the same public model, and the ranking is recomputed from the underlying product data rather than edited by hand.
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Retailer links may be affiliate links. Rankings and placement are never paid.
Vitamin D3 (Cholecalciferol) at 5000 IU is higher than the studied 400-4000 IU window.
Vitamin D3 (Cholecalciferol)
Studied window 400-4000 IU · this pick 5000 IU
Strong trust signals — consistently high marks from verified buyer ratings. Each product gets a DoseRank score blending clinical strength, evidence, dose fit, trust and value. Retailer links may be affiliate links — the scoring model decides placement, never payment from a brand.
$0.09 per serving — low price tier for this outcome. The cheapest ranked pick here is $0.08 per serving.
Why not the absolute cheapest? The DoseRank score also weighs clinical strength, evidence, dose fit and trust — the very cheapest listings rarely hold up everywhere else.
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The #1 pick is $0.09 a serving.Micro Ingredients, Vitamin D3 + K2, 300 Softgels — in stock at a tracked retailer.
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