Ruling on consuming hemp protein
Question

                I want to ask about protein made from the hemp plant, which can be found in sporting goods stores in the UK. Is it permissible to consume this protein as a natural source of energy? This substance does not contain THC.
Praise be to Allah.
    It says in al-Mawsoo‘ah al-‘Arabiyyah al-‘Aalamiyyah: 

    Hemp (also known as Cannabis) is a plant that is sometimes 
    cultivated for its strong fibres, which are obtained from the woody stems of 
    the plant and are used in making string and various kinds of rope. 

    Growing hemp is banned in most countries because it is 
    possible to obtain a psychoactive substance from it, known as marijuana or 
    hashish. End quote. 

    The cannabis plant has a serious effect on the body, hence 
    the fuqaha’ in the past and at present have stated that it is forbidden to 
    consume it, as has also been stated by legal systems worldwide. 

    See also the answer to question no.
    66227

    The psychoactive substance in cannabis that has an effect on 
    the brain and nervous system is that which the questioner referred to by its 
    acronym THC, which stands for tetrahydrocannabinol. 

    It is known that this psychoactive substance is not present 
    in leaves other than the flowering or fruiting tops, and it is not present 
    in the seeds. 

    The military doctor Muhammad Fathi ‘Eed (may Allah guide him) 
    said: 

    The cannabis plant is one of which cultivation is banned in 
    accordance with the Single Convention on Narcotic Drugs of 1961, which was 
    ratified by the Protocol of 1972. That is with the exception of a small 
    quantity that a country that is signatory to the Convention may need for 
    scientific research purposes. 

    The Convention clarified in clause (c) that what is meant by 
    “cannabis” is any plant of the genus Cannabis, whether it is male or female, 
    cultivated for the production of fibre or the production of drugs… 

    In the Single Convention on Narcotic Drugs it says: 
    “Cannabis” means the flowering or fruiting tops of the cannabis plant 
    (excluding the seeds and leaves when not accompanied by the tops) from which 
    the resin has not been extracted, by whatever name they may be designated. 

    The Convention stated that this definition does not include 
    cannabis leaves that are not attached to the tops and it does not include 
    the seeds. End quote from Jareemat Ta‘aati al-Mukhaddiraat fi’l-Qanoon 
    al-Muqaaran, 1/145, 146 

    Based on that, if the protein that is derived from the 
    cannabis or hemp plant is taken from one of these two things – other than 
    the flowering tops and seeds – which are in fact free of THC, then there is 
    nothing wrong with consuming it, so long as it does not have a negative 
    effect on the body apart from what may be caused by the psychoactive 
    substance. This is the general condition that applies to everything that is 
    available in the market of natural or manufactured substances that claim to 
    benefit the body by increasing energy. We have discussed this in our answer 
    concerning the ruling on sports energy drinks. Please see the answer to 
    question no. 163968. 

    And Allah knows best.