I've successfully fed my hens with turmeric paste when mixed with scratch grains. Have you tried that? BTW the hobbyfarms link to make turmeric paste is probably not the best way to do so. To enhance the potency of turmeric, try this method below which I have adapted from this publication (see
link):
Turmeric Paste Recipe
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The turmeric paste was prepared with freshly prepared turmeric powder, freshly ground black pepper, water and virgin olive oil at the ratio of 60g of turmeric: 2 cups of water:
1 to 2 teaspoon of black pepper:70mls of extra virgin olive oil, With this measurement, the mixture of turmeric and water were cooked for 10minutes. Olive oil and black pepper were
added at the end of the cooking. The golden paste was allowed to cool and appropriate dosages were calculated and given to the birds. Store in the fridge for 1 week.