---
title: "Reviews — vitamin d 400 iu - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/vitamin-d-400-iu/reviews"
last_updated: "2026-08-09T23:02:59.540Z"
locale: en
meta:
  description: "Niche score 46/100 · $121K/yr market · 93K searches/yr · $11.42 avg price. Doesn't clear our bar today. Data updated Aug 2026."
  "og:description": "Niche score 46/100 · $121K/yr market · 93K searches/yr · $11.42 avg price. Doesn't clear our bar today. Data updated Aug 2026."
  "og:title": "Reviews — vitamin d 400 iu - Flapen"
---

# **vitamin d 400 iu**

**Skip it**

A deep review moat (16,363 avg reviews) — this niche doesn't clear our bar today.

Market size 28Growth 30Conversion 93Competition 41Returns 100Price range 28Avg price 45Brand share 59Review moat 18Quality gap 19

**Returns**

**Incredible****0.0%**

return rate — above 5% kills the launch gate

**Conversion**

**Great****11.4%**

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

**Brand share**

**Good****70%**

top-5 brand share — brands hold most of the demand

**Avg price**

**Okay****$11.42**

avg listing price — sweet spot $15–$100

**Competition**

**Okay****60%**

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

**Growth**

**Okay****+3.8%**

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

**Market size**

**Okay****$121K**

$121K/yr · 93K searches

**Price range**

**Okay****$4.86–$18.97**

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

**Quality gap**

**Bad****4.7★**

avg incumbent rating — lower means beatable quality

**Review moat**

**Bad****16,362.77**

avg incumbent reviews — the moat a new listing must climb

## Reviews