You really need B3 to be at 4.5-5% for it to be efficacious and solubilized in 5% glycol (I like Pentylene glycol) and as others have mentioned H20 is a must. Have you tried Ethylated Ascorbic Acid? That is also oil soluble as is Ubiquinone. If you make an emulsion try adding Alpha Arbutin at 2% with the B3, it works very well on PIHP.

• This reply was modified 1 month, 4 weeks ago by  Hollis-Whyte.