---
title: "Reviews — vitamin d and magnesium supplement - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/vitamin-d-and-magnesium-supplement/reviews"
last_updated: "2026-08-10T04:27:37.243Z"
locale: en
meta:
  description: "Niche score 47/100 · $54K/yr market · 83K searches/yr · $17.98 avg price. Doesn't clear our bar today. Data updated Jul 2026."
  "og:description": "Niche score 47/100 · $54K/yr market · 83K searches/yr · $17.98 avg price. Doesn't clear our bar today. Data updated Jul 2026."
  "og:title": "Reviews — vitamin d and magnesium supplement - Flapen"
---

# **vitamin d and magnesium supplement**

**Skip it**

A small market ($54K/yr) — this niche doesn't clear our bar today.

Market size 13Growth 21Conversion 45Competition 57Returns 100Price range 69Avg price 82Brand share 75Review moat 25Quality gap 22

**Returns**

**Incredible****0.0%**

return rate — above 5% kills the launch gate

**Avg price**

**Great****$17.98**

avg listing price — sweet spot $15–$100

**Brand share**

**Great****60%**

top-5 brand share — no brand owns this niche

**Price range**

**Good****$5.33–$36.63**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Competition**

**Good****51%**

top-5 click share — leaders hold, buyers still browse

**Conversion**

**Okay****3.6%**

search→purchase rate — share of searches ending in a sale

**Review moat**

**Bad****4,180.6**

avg incumbent reviews — the moat a new listing must climb

**Quality gap**

**Bad****4.7★**

avg incumbent rating — lower means beatable quality

**Growth**

**Bad****-7.1%**

90-day search growth — must beat 0% to launch

**Market size**

**Bad****$54K**

$54K/yr · 83K searches

## Reviews