Recently I have been reading up on the nutrients on how to grow a healthy flock. I found the article here on the BYC learning center. It was helpful with nailing down the 9 most important things a chicken needs to thrive and flourish. One of those things are Calcium, hence a healthy amount of Oyster Shell. Another is adequate amounts of sunlight. And if you live the the Pacific Northwest, most of us are Vit D Deficient, I reside on the Oregon coast. I have some pullets that are just beginning to lay and the rest are 5 months - 1 1/2 yrs old. I have just finally had the experience of a hen that layed a jello egg and also I found one of my younger hens eating the yoke to a second jello egg. I was recently given a bottle of Oystercal-D 500 mg. The back say's 250 IU of Vitamin D and 1000 mg Calcium, from Oyster Shell. I am wondering if I can crumble some of the pills up and put it in the water and or food? If so how much and how should I administer? I am figuring that these jello eggs are from a new layer that is not interested in the Layena feed that I am providing. My flock is free range and they are also enjoying the wild bird seed and sunflower seed's (set out for the wild birds) more than the feed. Not my idea, my grandpa likes to be.... a grandpa (what can I say). Just a thought of what vitamins are safe and which aren't. How much and how to give. I could probably just look this information up on here, I just wanted to ask it straight out though, so I could get a straight answer. Also everyone's scenarios are different. Which, if any Vitamin's, do you give your flock? Thanks for your time!