Ok-so I've been riding for 40 years, and teaching and training for 20. I have always based a horses' jump on his athletic abilities, scopiness, etc. I've seen the solid, 2'6 packers that can stretch to 3' but are better suited to the 2'6 job.
Bioactive vitamin D or calcitriol is a steroid hormone that has long been known for its important role in regulating body levels of calcium and phosphorus, and in mineralization of bone.
Vitamin A overdose: Introduction. Excessive Vitamin A intake usually occurs through consumption of large amounts of Vitamin A supplements. Vitamin A is used in the body for vision, immunity and bone and tissue growth and maintenance. Excessive Vitamin A use during pregnancy may increase the risk of birth defects. Vitamin A overdose can cause symptoms such as orange skin, blurred vision and nausea.