1.   And because testosterone speeds the production of red cells, it could thicken the blood, thus raising the risk of stroke.

2.   Dehydration occurs because the body tries to thicken its blood to improve absorption of the scanty oxygen.

3.   In excessive doses, it can thicken the blood, causing strokes or heart attacks.

4.   The drug has been linked to more than a dozen deaths by heart attacks among amateur and professional riders in recent years because it thickens the blood.

5.   To cope with the rarefied atmosphere at high altitude, the body produces more oxygen-carrying red blood cells, which thicken the blood.

6.   EPO thickens the blood and increases risks of thrombosis and heart attacks.

7.   EPO stimulates the bone marrow to produce more blood cells, causing less water and thickening the blood.

8.   EPO thickens the blood and increased the risks of thrombosis and heart attack.

9.   The hormone thickens the blood and increases risks of thrombosis and heart attacks.

10.   The substance thickens the blood, producing clotting and possible heart attacks.