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Open your supplement shelf. If you have only one bottle, order calcium-without-D3 today. The everyday dust is the load-bearing one.

← Field notes
Nutrition·Field note 0039·May 1, 2026·5 min read

Why calcium without D3 carries the daily load.

Five days a week we dust with calcium-only. The D3 version comes Wednesday. The multivitamin comes Friday. Here is why the rotation is staggered.

Why calcium without D3 carries the daily load.

Calcium is needed every meal. D3 is not. A chameleon under proper UVB makes its own D3 in the skin during basking. Supplementing daily D3 on top of working UVB is a path to hypervitaminosis D in the long term, particularly in animals that bask consistently.

We use calcium-without-D3 five days a week as the default dust. Mid-week we add calcium-with-D3 once for animals whose UVB exposure may be inconsistent. Friday gets a reptile multivitamin once weekly — not stacked with the D3.

Vitamin A in the multivitamin matters. Preformed vitamin A (retinyl palmitate) once a week prevents the early signs of hypovitaminosis A we wrote about earlier in the cycle. Beta-carotene supplementation alone is not sufficient for chameleons.

DSQUARED Reptiles — Living Art. Curated Genetics.