The vitamin C content of sea-buckthorn is almost 10 times higher than of lemons. And, as I know, sea-buckthorn is the only fruit that contains vitamin B12. Until about 20-25 years ago, I collected the berries. But because of the effort, I only used little for making fruit jam. The most I used together with sloes for the production of a highly palatable fruit wine. ...очень вкусно! :-)
But yes, you are right! :-) ...today, I fear the effort, I collect no more berries.
To expel my winter tiredness I prefer to buy vitamin B12 and to use my free time for cycling. :-)