Chill coconut milk cans overnight. Scoop only the solid cream into a saucepan.
Whisk in agar-agar powder until smooth.
Heat over medium, whisking constantly, until it simmers for 1-2 minutes.
Remove from heat and cool to 110°F (43°C) (warm to the touch).
Whisk in the contents of the probiotic capsules.
Pour into a clean glass jar, cover, and incubate in a warm place (like an oven with the light on) for 12-24 hours.
Transfer the jar to the refrigerator and chill for at least 6 hours, or overnight, to set.
Stir gently and serve.
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Notes
For the creamiest yogurt, it is essential to use full-fat canned coconut milk, as other types will not thicken correctly. Watch the temperature closely. Let the mixture cool to 110°F (43°C) before adding the probiotics. This will keep the cultures alive. You can change the flavor by adjusting the incubation time. A full 24 hours makes a tangier yogurt. If you incubate for 12-18 hours, it will taste milder. For an even thicker, Greek-style consistency, strain the finished yogurt through a cheesecloth. Finally, remember to save a few tablespoons of your finished yogurt to act as the starter for your next batch.