Zahler Junior D3 & K2™ – Children’s D3 & K2 Formula | Supports Bone Density & Calcium Absorption | 90 Chewable Tablets

Six-dimension breakdown

Why this scored 66/100

Zahler is a well-established kosher supplement brand (Advanced Nutrition by Zahler, based in Brooklyn NY, established 1950s as a family pharmacy) with a genuine specialty position in the kosher supplement market. The Junior D3 & K2 chewable is a pediatric formulation of the well-evidenced D3+K2 combination — vitamin D3 for the widespread pediatric deficiency (particularly in northern-latitude, indoor-lifestyle children) with real evidence for bone development, immune function, and reduction of respiratory infection frequency in some pediatric populations; vitamin K2 for calcium direction to bone matrix during the developmental window when peak bone mass is being established. Chewable tablet format is pediatric-appropriate. The 90-tablet count is a typical multi-month supply. Marks reflect: legitimate kosher-market brand with real manufacturing infrastructure, evidence-supported pediatric formulation choice, and reasonable label transparency. Kids' supplementation should always be discussed with a pediatrician, especially for fat-soluble vitamins where excess is possible; verify the per-tablet dose (D3 typically 400-1000 IU for children, K2 typically 25-45 mcg pediatric range) aligns with pediatric dosing guidance for age. Standard tier reflects the legitimate brand and defensible pediatric formulation.

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.

FAQ data has not been generated for this product yet. See the site FAQ for general questions.

Customer reviews

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

66 / 100

Tier

Standard

Category

Supplements

Subcategory

vitamins micronutrients

Last scored

August 24, 2026

Third-party certifications

None on record at time of scoring

Vendor

SINGERS HEALTH PRODUCTS

Product type

Children's Supplements

Tags

Shopify Collective, SINGERS HEALTH PRODUCTS

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.