Increase autophagy (for anti-aging), during intermittent fasting with this stack (studies below):

1. Nicotinamide Riboside as Niacel or Resveracel
2. Pterostibene or Pterostilbene & Resveratrol
3. Hydroxycitrate (HCA) from Garcinia & Green Coffee or Garcinia Cambogia
4. EGCG (Green Tea extract)
5. coffee
6. water

Reference / Read more:

• http://www.garmaonhealth.com/intermittent-fasting-cellular-autophagy/
• http://www.sciencedirect.com/science/article/pii/S1021949816301855
• https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4500936/
• http://roguehealthandfitness.com/intermittent-fasting-boosters-autophagy-enhancers/
• https://www.ncbi.nlm.nih.gov/pubmed/26306884
• https://www.quora.com/What-is-the-difference-between-nicotinamide-riboside-and-B3-vitamin-niacin
• https://www.ncbi.nlm.nih.gov/pubmed/23754277
• https://www.ncbi.nlm.nih.gov/pubmed/24769862
• https://blog.bulletproof.com/bulletproof-fasting/