Hello
Myristyl Nicotinate (Pro-Niacin™) is not directly soluble in oil.
Retinal (Retinaldehyde) is even oil soluble. But it must be in a creamy or thick formula. not too liquid to prevent
Retinal precipitate. This will result in a loss of performance. Other ingredients can be combined. Please check the usage rate of each ingredient. According to the manufacturer or the FDA specified on the website.