Everyone Is Different But For Weightloss I Believe It's Safe To Assume That You Will Lose At Least 1 To 2 pounds Per Day Depending On Your Body. The First Fast I Did Was For 30 Days And I Didn't Take Any Supplements Because I Didn't Feel As Though I Needed Them, However If One Is Fasting For 45 Days Or More I've Read That It's Best To Take A Supplement To Avoid Depleting Your Nutritional Storage And Running Into Issues So I Have Been Taking A Raw Vegan Vitamin Named Raw One- Women's Multi Vitamin. In Case You Wanted To Look More Into Water Fasting I Reccommend Dr. Isabelle A. Moser. She Oversaw 2 90 Day Fasts With Extremely Overweight Individuals And Her Conclusions Motivated Me To Do This Fast.