Emotion suppression - This part is described as currently being much more well known than with other stimulants, and it is in-line with the pointed out emotion-suppressing effects which have been observed with other stimulants, but notably methylphenidate and associated compounds. 4F-MPH has an especially limited record of recreational use. https://4fphp56789.bloggazzo.com/29640224/the-4f-php-effects-diaries