Resin is the raw purified material. Powder is resin that has been dried and often bulked out with carriers. Gummies contain the smallest amount of actual shilajit per serving and add sugar, gelatine and flavouring.
If purity and cost per serving matter, resin is the format to buy. Format is also the first thing to check when a shilajit price looks unusually low.
Ayor Health sells pure Himalayan shilajit resin in the UK from £34.99 (20g), £49.99 (30g) and £69.99 (50g). Every batch is independently tested by Eurofins UK and the reports are published in full at /lab-results.