DIY Photosynthesis Plus(PSB/PNSB) & Cyanobacteria recipes.

EM1 essentially labs and photo plus in one. Em1 has higher levels of labs than photo plus. I personally use homemade labs and Photosynthesis plus in my regimen. The only difference is the different strains Lactobacillus you may culture at home. Em1 is constantly the same strains.

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