Zoo Med Dr. Turtle Slow-Release Calcium Block Turtle Supplement

By Zoo Med
Rated 4.3529 out of 5 stars


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This Item – Zoo Med Dr. Turtle Slow-Release Calcium Block Turtle Supplement, 2 count
Rated 4.3529 out of 5 stars
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About This Item


  • Helps provide your turtle with the required calcium he needs.
  • Encourages proper shell growth and development when accompanied with UVB lighting and heat.
  • The block slowly releases calcium as it dissolves.
  • Easy-to-use—simply place the turtle-shaped block into your pet’s water.
  • Helps condition water to encourage a healthy environment for your BFF.

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Nutritional Information

Feeding Instructions

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Top IngredientsCalcium Sulfate, Magnesium Chloride.Calcium Carbonate, Dicalcium Phosphate, Calcium Phosphate...Calcium Carbonate, Oyster Shell Flour, Dextrose...Limestone Flour, Flavor, D-Activated Animal Sterol (Source of Vitamin D-3)....Precipitated Calcium Carbonate.
Food FormFeeders / Blocks, SupplementSupplementSupplementSupplementPowder, Supplement
Health FeatureVitamins & MineralsVitamins & MineralsVitamins & Minerals

Questions & Answers

13 Customer Questions

Is it safe if your turtle were to eat it?

How often should I use this? After every water change? I have a 75 gallon. Should I put in 5 blocks each time?

Is this to prevent any damage in the future for the turtles or is this for the turtles while they already have some kind of calcium deficiency? My turtles are still babies but I want them to grow healthy. Should I buy this now or wait to they grow older?
Answer by ChewySep 26, 2019
The Zoo Med Dr. Turtle Slow-Release Calcium Block Turtle Supplement can be used to help prevent issues as well as treat some soft shell issues. It can safely be used with hatchling turtles.

If I use these with yellow bellied sliders, do I still need to use the calcium powder when feeding them?
Answer by ChewyJan 26, 2022
The slow-release calcium block can be used with yellow belly sliders, it will help add calcium to the water which they will consume when drinking. However, Zoo Med does not recommend using a calcium powder when feeding them as it can just foul the water. Make sure they are being fed a balanced pelleted diet with added vitamins and minerals.

ReviewsWrite a Review

Rated 4.3529 out of 5 stars
17 Ratings
Would recommend to a friend

17 Customer Reviews

Rated 3 out of 5 stars
By MiamiGirl on Jul 30, 2023

Hard to rate this

I put it in. It dissolved and all was well. Have no idea if it helped to be honest. Didn’t hurt anything though.

Rated 5 out of 5 stars
By jimjam on Nov 22, 2022

Painted turtle seems to like it

I know turtles need supplements, uvb lights etc so I use these regularly in my 100 gallon tank. I put 3 in after every water change and one every week. After a water change they usually bubble and dissolve quicker, sometimes they last longer I think it depends on the condition of the water but I don't know. I've seen him nibble on the block but after a few weeks of using these I haven't seen him trying to eat it but I'm told it won't hurt them if they do. Must have for aquatic turtles

Rated 5 out of 5 stars
By love on Jun 6, 2023

I LOVE this stuff.

My turtle loves it

Rated 5 out of 5 stars
By Shelly1967 on Aug 16, 2022

Super Product

My baby slider went right to it when I dropped it in a clean tank it started to slightly dissolve a bubble my turtle loves to bite off the arms and legs it is kind of funny ,I feel very confident he is getting what he needs to stay healthy.

Rated 5 out of 5 stars
By Juliebird on Jul 2, 2022

Roger's treat

Roger, our rescued red ear slider, loves these and eats them right up! Roger has a funny personality who loves to show off whenever anyone is around! Very cool turtle

Rated 1 out of 5 stars
By White on May 14, 2022

Very disappointed

This literally dissolves in 2 days in a 30 gallon tank of water.

Rated 5 out of 5 stars
By Luna on Jan 10, 2022

Freshwater snail/shrimp tank !

Everyone loves this ! My snails shells are slowly getting more colorful now that I’ve put this in my tank ! I wish I could hide it a little more but it’s cute enough so it’s not an issue

Rated 2 out of 5 stars
By jaylynn on Dec 10, 2021

I dont know what i did wrong

I don't know if im overreacting but when i first put mine in the tank you could see it starting to dissolve then it stopped and now 24 hours later it looks the exact same and i see nothing happening to it, and my turtle is showing no interest

Rated 5 out of 5 stars
By Claire on Oct 31, 2021

Great product

The calcium block is great for my snails and turtles shell health, very easy to use and I like how it’s safe if ingested by the turtle.

Rated 5 out of 5 stars
By Chevy on Sep 20, 2021

Good Product

I put this in. My turtle tank! After 10 days water in tank still very clear!