Optimum Nutrition
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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 →
NBTLife Life Guard is a Turkish-brand trace-mineral immune blend (zinc, copper, iodine, selenium) with no per-ingredient mg visible from the title and no US third-party testing chain. Individual minerals have decent immune evidence (Prasad zinc studies; Hoffmann selenium reviews), but form matters — zinc oxide vs picolinate, selenomethionine vs sodium selenite. Reseller-channel via Beauty Care Bag adds no QC. Would move to Standard 65+ with per-mineral form and mg disclosure plus US-market batch traceability.
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.
Auto-generated from Vyvata's scoring data for this product. For general questions about the store (shipping, returns, wholesale), see the site FAQ.
NBTLife Life Guard Dietary Supplement - Zinc, Copper, Iodine, Selenium Capsules for Immune System Support, 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.
56/100 overall — Standard tier (50–69 band). Per-dimension breakdown: Evidence 60, Safety 60, Formulation 55, Transparency 55, Sustainability 55, Manufacturing 50. Scored as of 2026-08-24.
NBTLife Life Guard is a Turkish-brand trace-mineral immune blend (zinc, copper, iodine, selenium) with no per-ingredient mg visible from the title and no US third-party testing chain. Individual minerals have decent immune evidence (Prasad zinc studies; Hoffmann selenium reviews), but form matters — zinc oxide vs picolinate, selenomethionine vs sodium selenite. Reseller-channel via Beauty Care Bag adds no QC. Would move to Standard 65+ with per-mineral form and mg disclosure plus US-market batch traceability.
Strongest: Evidence at 60/100 (quality of published RCT support for the active ingredients at the label dose) and Safety at 60/100 (adverse-event profile, interaction risk, and dose ceiling). Weakest: Sustainability at 55/100 (sourcing practices, packaging, and corporate practice) and Manufacturing at 50/100 (third-party testing, GMP compliance, and facility audit status). All six dimensions feed the overall Vyvata score; a weakness on any one dimension pulls the overall down proportionally.
No third-party certifications (NSF, USP, ConsumerLab, or equivalent) were on record at the time of scoring. This affects the Manufacturing dimension score. The manufacturer may test internally or have obtained certification more recently — check the current product label for the most up-to-date information.
Would move to Standard 65+ with per-mineral form and mg disclosure plus US-market batch traceability.
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.
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.
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=NBTLife%20Life%20Guard%20Dietary%20Supplement%20-%20Zinc%2C%20Copper%2C%20Iodine%2C%20Selenium%20Capsules%20for%20Immune%20System%20Support),Google(https://www.google.com/search?q=NBTLife%20Life%20Guard%20Dietary%20Supplement%20-%20Zinc%2C%20Copper%2C%20Iodine%2C%20Selenium%20Capsules%20for%20Immune%20System%20Support+reviews),Reddit(https://www.reddit.com/search/?q=NBTLife%20Life%20Guard%20Dietary%20Supplement%20-%20Zinc%2C%20Copper%2C%20Iodine%2C%20Selenium%20Capsules%20for%20Immune%20System%20Support%20review),andTrustpilot(https://www.trustpilot.com/search?query=NBTLife%20Life%20Guard%20Dietary%20Supplement%20-%20Zinc%2C%20Copper%2C%20Iodine%2C%20Selenium%20Capsules%20for%20Immune%20System%20Support).Vyvatadoesnotaggregate,republish,orlicensethosethird-partyreviews.
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.
Every VSF-related metafield surfaced verbatim. Nothing hidden. If you spot data that looks wrong, let us know.
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.

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