Not trying to be a dick, but spirulina is very high in GLA (Gamma Linolenic Acid) which is a potent DHT inhibitor. I bought spirulina at first then read about it and I just stay with chorella now instead. If you handle it fine, awesome, but I would personally stay away. See below:
Another source of DHT blockers is Gamma-linolenic acid (GLA), an essential fatty acid (EFA) found mostly in plant-based oils such as evening primrose oil, black currant seed oil, and borage oil. EFAs are necessary for healthy brain function, bone health, stimulation of skin and hair growth, and metabolism. GLA has been shown in studies to inhibit DHT-enhanced activity of 5 alpha-reductase. (4) In one study, animals treated with GLA had a noticeable effect on inhibiting 5 alpha-reductase type 2.(5) In the study, researchers investigating another compound that inhibited 5 alpha-reductase type 2 suggested this particular agent might be effective for fighting male pattern baldness.
5 alpha-reductase-catalyzed conversion of testosterone to dihydrotestosterone is increased in prostatic adenocarcinoma cells: suppression by 15-lip... - PubMed - NCBI
The extract of Thujae occidentalis semen inhibited 5alpha-reductase and androchronogenetic alopecia of B6CBAF1/j hybrid mouse. - PubMed - NCBI
GLA Is A Powerful DHT Inhibitor