Dear Gnostic Instructors;

What might be the unseen effects of blood donation ? Does the blood carry positive or negative qualities and is there any danger for both of the people involved to acquire unnecessary karma ? In blood brotherhood, and Eucharist described by Samael Aun Weor the blood is shared in a ceremonical way and connects the Astral vehicles. But does it also include blood donation ?
In his writings he states that blood is a special fluid.
Can we donate blood to people who have blood cancer or any other disease and need blood or should we look for other ways to help them ?
Also if there are bad consequences of blood donation what can be done for people who truly need blood ?