If you just want a natural white paint, you have quite a few options.
Top choice for improved indoor air quality would be the Graphenstone Ambient pro or Auro’s Anti Allergy
The best all rounder would be either the Graphenstone’s Grafclean or Auro’s 524 – both excellent and easy to use.
Want lime based white, try Ecosphere. Clay Paint, Auro 331. For cheap economy try Nevada