Are you sure your syringe just isnt worn out? I dont know if your blood can actually thicken
Cant really tell if its just the nurse taking my blood named it like that, or is an actual fact. That the thickness of blood differs among people. My granny told me my grandfather was also told this in a hospital. And does it differ in a person, by factors like fluid intake, food or a herb or drug?
But she used my left arm hit a vain and the blood came but so slow it wasn't useable, she said you have thick blood. Offered her my right arm where a big vain is on top, visually clear to see. She pulled and drawed and that, my easy vain did its job.
Certain foods like Garlic, Alcohol and Asperin/ Acetyl-Salicylic-Acid also thin your blood. Maybe the Garlic is caused by personal chemistry.
Using Ginkgo Biloba extracts gave bloodnoses [my vains are very close to the surface/ thin skinned], but its just a guess Ginkgo caused it by that effect. You can look it up if it its an effect of my favorit tree, and if it has an interaction with Meth.
Once took st. Johns Worth while on methylphenidate, without being aware of any interaction. Didnt really go well raising hearth and insomnia! So now a days i always check before with herbs, medications and supplements.