Grifols — Biomat USA San Marcos TX-I-35 S
$720 new-donor bonus Open weekends
Spectrum Plasma (SpecPlasma)
Independent · 137 N. Guadalupe St., San Marcos, TX 78666
Contact this plasma donation center directly
Everything on this page is sourced and dated, but details change without notice. Contacting them directly is the only way to be certain before you travel.
No open weekends
Independent plasma center in San Marcos, closed Friday through Sunday. Rewards are issued as Tango gift cards redeemable at multiple merchants; no dollar compensation amounts are published.
Hours
| Monday | 09:00 – 17:00 |
|---|---|
| Tuesday | 09:00 – 17:00 |
| Wednesday | 09:00 – 17:00 |
| Thursday | 09:00 – 17:00 |
Data last verified 2026-07-21.
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