Optimum Nutrition
1
/
of
4
Vitamin D-3 5,000 IU High Potency
Vitamin D-3 5,000 IU High Potency
Brand ownership disclosure
Country Life Natural Foods (Kikkoman subsidiary)
Kikkoman Corporation (TSE: 2801, Japan)
Acquired 1993 by Kikkoman — the same Japanese conglomerate behind Kikkoman soy sauce + Del Monte Asia. Country Life brand kept intact under Kikkoman Biotech Holdings.
Regular price
$17.95 USD
Regular price
Sale price
$17.95 USD
Shipping calculated at checkout.
Quantity
Couldn't load pickup availability
The full picture
Everything Vyvata knows about this product — the score, the evidence, the FAQ, and where else to find shopper reviews. No hidden data. Every vendor is scored on the same published rubric — no brand can pay for placement. Read the rubric →
72/100
Verified
Six-dimension breakdown
Evidence
72
Formulation
68
Manufacturing
65
Safety
68
Transparency
68
Sustainability
55
Why this scored 72/100
[Rescored via evidence crawl] Previous score 67 → new 72. Evidence found: Pilz S, Zittermann A, Trummer C, et al. Vitamin D testing and treatment: a narrative review of current evidence. Endocr Connect. 2019;8(2):R27-R43. doi:10.1530/EC-18-0432 | Villasis-Keever MA, López-Alarcón MG, Miranda-Novales G, et al. Efficacy and Safety of Vitamin D Supplementation to Prevent COVID-19 in Frontline Healthcare Workers. A Randomized Clinical Trial. Arch Med Res. 2022;53(4):423-430. doi:10.1016/j.arcmed.2022.04.003. Rationale: 5,000 IU/day sits at the therapeutic sweet spot — well-supported for correcting deficiency and safe in most adults short-to-medium term, with the Calgary trial's harmful bone-density signal appearing only at 10,000 IU (not 5,000). Multiple RCTs. +5 uplift to 72 crosses into Verified. Ceiling held below 80 because vitamin D benefit is highly individual (depends on baseline 25(OH)D and sun exposure) and long-term unsupervised use still warrants periodic 25(OH)D monitoring.
Last scored: Full rubric →
Evidence & sources
The Vyvata score's Evidence dimension measures the quality of published RCT support for a product's active ingredients at the label dose. Our source hierarchy: double-blind RCTs in MEDLINE-indexed journals > single-blind RCTs > open-label trials > observational studies > mechanism papers > N=1 case studies (anecdotes). Predatory journals and manufacturer-authored studies without independent replication are weighted down.
Product-specific evidence citations for this item are embedded in the analysis text on the "Analysis" tab. For the full framework and evidence hierarchy, see the methodology page.
How to read the Evidence dimension
- 80–100: Multiple double-blind RCTs in indexed journals directly testing this product OR the exact ingredients at the exact dose.
- 60–79: Single double-blind RCT + supporting ingredient literature at the studied dose.
- 40–59: Open-label trials + ingredient literature; no product-specific double-blind evidence.
- 20–39: Ingredient literature only; no product-specific trials or trials in predatory venues.
- 0–19: No credible evidence base or unverifiable claims.
Frequently asked questions
Auto-generated from Vyvata's scoring data for this product. For general questions about the store (shipping, returns, wholesale), see the site FAQ.
What is Vitamin D-3 5,000 IU High Potency?
Vitamin D-3 5,000 IU High Potency is a product from Country Life Natural Foods, categorized under Vitamins & foundational micronutrients in the Supplements vertical. It is scored on the Vyvata Scoring Framework — an independent 6-dimension rubric applied uniformly to every product Vyvata lists.
How does Vitamin D-3 5,000 IU High Potency score on the Vyvata rubric?
67/100 overall — Standard tier (50–69 band). Per-dimension breakdown: Evidence 72, Formulation 68, Safety 68, Transparency 68, Manufacturing 65, Sustainability 55. Scored as of 2026-08-24.
Why did Vitamin D-3 5,000 IU High Potency score in the Standard tier?
5,000 IU D3 softgel by NOW under NPA A-rated GMP. 5,000 IU/day is well within the tolerable upper intake and matches deficiency-correction dosing per Endocrine Society guidelines (Holick 2011). Solid Standard, edging Verified on QA.
What are the strongest and weakest aspects of this product?
Strongest: Evidence at 72/100 (quality of published RCT support for the active ingredients at the label dose) and Formulation at 68/100 (dose adequacy, bioavailability form, and ingredient redundancy). Weakest: Manufacturing at 65/100 (third-party testing, GMP compliance, and facility audit status) and Sustainability at 55/100 (sourcing practices, packaging, and corporate practice). All six dimensions feed the overall Vyvata score; a weakness on any one dimension pulls the overall down proportionally.
Is Vitamin D-3 5,000 IU High Potency third-party tested?
Third-party certifications on record: GMP Certified, Kosher, Halal. These contribute to the Manufacturing dimension score. Always check the current product label for the most up-to-date certification information.
Are there higher-scoring alternatives to Vitamin D-3 5,000 IU High Potency?
The top-ranked vitamins & foundational micronutrients product in the Vyvata catalog is currently Thorne Basic Nutrients 2/Day at 89/100. See the full ranked list of 635 scored products in this subcategory at https://vyvata.com/pages/best-vitamins-and-foundational-micronutrients-supplements-ranked.
What does the Vyvata score mean?
The Vyvata Scoring Framework rates every listed product 0–100 across six dimensions: Evidence, Formulation, Manufacturing, Safety, Transparency, and Sustainability. Tier bands: Elite 85–100 (top-tier evidence + formulation + manufacturing), Verified 70–84 (strong on most dimensions), Standard 50–69 (solid but with weaknesses called out), Rejected 0–49 (specific failures documented). Rejected products remain listed with reasons. Full methodology at https://vyvata.com/pages/methodology.
Where can I read customer reviews for Vitamin D-3 5,000 IU High Potency?
The Vyvata score measures product integrity against a published rubric, not customer sentiment. For customer reviews and community discussion, search external platforms directly: Amazon (https://www.amazon.com/s?k=Country%20Life%20Natural%20Foods%20Vitamin%20D-3%205%2C000%20IU%20High%20Potency),Google(https://www.google.com/search?q=Country%20Life%20Natural%20Foods%20Vitamin%20D-3%205%2C000%20IU%20High%20Potency+reviews),Reddit(https://www.reddit.com/search/?q=Country%20Life%20Natural%20Foods%20Vitamin%20D-3%205%2C000%20IU%20High%20Potency%20review),andTrustpilot(https://www.trustpilot.com/search?query=Country%20Life%20Natural%20Foods%20Vitamin%20D-3%205%2C000%20IU%20High%20Potency).Vyvatadoesnotaggregate,republish,orlicensethosethird-partyreviews.
Customer reviews
Reviews on other platforms
The Vyvata score measures product integrity against a published rubric, not customer sentiment. Vyvata does not aggregate, republish, or license third-party reviews — the links below open search pages on their respective platforms.
All the data we have on this product
Every VSF-related metafield surfaced verbatim. Nothing hidden. If you spot data that looks wrong, let us know.
- VSF score
- 72 / 100
- Tier
- Verified
- Category
- Supplements
- Subcategory
- vitamins micronutrients
- Last scored
- Third-party certifications
- GMP Certified, Kosher, Halal
- Vendor
- Country Life Natural Foods
- Product type
- Vitamins & Supplements
- Tags
- Country Life Natural Foods, Shopify Collective
Every score is set from the published rubric, audit-logged, and rescored whenever new evidence emerges (published trials, updated labels, third-party testing releases). Every vendor is scored on the same criteria — no pay-to-play. See our editorial-independence disclosure for the full policy, including brands with an editorial relationship to this site.
Share
