oyster shell calcium 500mg
Skip itBrand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible15.3%search→purchase rate — share of searches ending in a sale
Avg price
Great$16.31avg listing price — sweet spot $15–$100
Price range
Good$7.00–$34.76cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Good886.39avg incumbent reviews — the moat a new listing must climb
Growth
Okay+13.7%90-day search growth — must beat 0% to launch
Competition
Okay69%top-5 click share — leaders hold, buyers still browse
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Market size
Bad$80K$80K/yr · 32K searches
Brand share
Bad97%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, oyster shell calcium 500mg is a $80K/yr Amazon United States market (32K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 47/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
oyster shell calcium 500mg market data
- Units sold / yr
- 5K–6K
- avg 250–500/product
- Revenue / yr
- $82K–$98K
- units × avg price
- Conversion rate
- 15.3%
- Avg BSR
- #946
- Page quality
- 0%
- Prime
- 89%
- Sponsored
- 56%
- Out of stock
- 0.5%
- Avg brand age
- 89 months
- Avg seller age
- 152 days
Competition & brand share
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.Brands
7 flat
Sellers
45
Top-5 brand share
97%
Top 20: 100%
Top-5 click share
69%
Top 20: 100%
Open market
1%
- MAJOR54%
- Nature's Blend31%
- GeriCare7%
- MASON NATURAL3%
- Pecking Order2%
- Organics Ocean2%
- Open — no brand owns it (1 brand, 1%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +13.7% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Top oyster shell calcium 500mg search terms
- oyster shell calcium 500mg14K/yr
- oyster shell calcium14K/yr
- oyster shell calcium 500mg with vitamin d34K/yr
Top oyster shell calcium 500mg products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 18 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Major Oyster Shell Calcium 500 mg - Daily Calcium Supplement - 300 Tablets (1-Pack)
MAJOR$11.894.7★775 rev
Major Oyster Shell Calcium with Vitamin D3 500 mg / 5 mcg (200 IU) - Daily Calcium Supplement - 300 Tablets (1 Pack)
MAJOR$14.534.8★1,036 rev
Natures Blend Oyster Shell Calcium 500 mg 100 Tabs (1683)
Nature's Blend$9.554.7★586 rev
Natures Blend Oyster Shell Calcium 500 mg Tablets - 100 ct Pack of 2
Nature's Blend$17.844.7★586 rev
GeriCare Oyster Shell Calcium 500 mg Bone Health & Strength Nutritional Supplement Supports Muscle Functions 100 Count (Pack of 1)
GeriCare$7.734.7★37 rev
Newest
by launch date
Organics Ocean Better Calcium - Organic Red Algae Calcium with Vitamin D3 and K2 Supplements - Supports Bone Structure Joint Comfort & Encourages Healthy Aging - Plant-Based Non-GMO - 1 Pack
Organics Ocean$34.76102 rev
GeriCare Oyster Shell Calcium 500mg + Vitamin D Bone Health Nutritional Supplement Tablets 250 Count (1 Pack)
GeriCare$10.0721 rev
Major Oyster Shell Calcium 500 mg - Daily Calcium Supplement - 300 Tablets (2-Pack)
MAJOR$20.48775 rev
Major Oyster Shell Calcium 500 mg - Daily Calcium Supplement - 300 Tablets (3-Pack)
MAJOR$26.34775 rev
MAJOR Oyster Shell Calcium 500mg Tablets with Vitamin D3 200IU (5 mcg) - Gluten-Free Daily Vitamin D Dietary Supplement for Bone Health and Calcium Absorption 150 Count
MAJOR$12.436 rev
Trending
90-day click momentumOrganics Ocean Better Calcium - Organic Red Algae Calcium with Vitamin D3 and K2 Supplements - Supports Bone Structure Joint Comfort & Encourages Healthy Aging - Plant-Based Non-GMO - 1 Pack
Organics Ocean$34.764.6★
Natures Blend Oyster Shell Calcium 500 mg + D - 100 Tablets Pack of 2
Nature's Blend$20.874.7★
Oyster Shell Calcium with D3 100 Tabs
Nature's Blend$11.384.8★
GeriCare Oyster Shell Calcium 500mg + Vitamin D Bone Health Nutritional Supplement Tablets 250 Count (1 Pack)
GeriCare$10.074.7★
Natures Blend Oyster Shell Calcium 500 mg Tablets - 100 ct Pack of 2
Nature's Blend$17.844.7★
What buyers say about oyster shell calcium 500mg
What buyers praise and complain about, mined from review topics.What buyers love
“Helps keep calcium levels up”
“Good value”
“A+ quality”
“Just as described”
“Easy for them to eat”
“easy to use”
“good size i think”
“Good taste”
“Easily absorbed”
“Easy digest”
What buyers complain about
“very tiny”
“they dont seem to bother me as much as other calcium I tried”
“it is not inexpensive”
“cheaper and more pills”
“False advertising”
“I choke on it about every three or four times I take it”
“Unhealthy additives”
“highly doubt heat treated”
“spilled everywhere”
“The oyster shell are good for the chicken makes the shell harder”
Top return reasons
Common questions
- Is oyster shell calcium 500mg profitable to sell on Amazon United States?
- The niche generates $80K/yr across 18 tracked products. 1 of 4 products launched in the last 360 days are still selling. 90-day search growth is +13.7%. Flapen's verdict: Skip it (47/100).
- How competitive is the oyster shell calcium 500mg niche?
- 7 brands and 45 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 97% of demand.
- What do buyers complain about in oyster shell calcium 500mg?
- Top complaints mined from reviews: Size-Overall, Calcium, Value For Money. The return rate is 0.0%.
- When does demand for oyster shell calcium 500mg peak?
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- What does it cost to enter the oyster shell calcium 500mg niche?
- Listings span $7.00–$34.76; the average listing price is $16.31 (sweet spot $15–$100). The average incumbent carries 886 reviews — the moat a new listing must climb.