This is the first mixed product with doses that appear useful.

Usually the mixed things are high in one thing and low in others, or vice versa.

Yes, most definitely do the acetyl carnitine. Start at 250mg a day for week, if that goes well, with no side effects, increase by 250mg daily for a week until at least 1000mg a day in divided doses.

Carnitine improves mitochondrial functions which can be damaged by chemo.

The elderly should be taking B12 daily anyway... not just for PN.

Some people complain of stomach upset from alpha lipoic acid.
This may become a problem, because taking with food helps. And with that B12 in there, you can't take with food. This is the downside to mixed products. If you take them separately you would pay a similar price but could taylor some dosing if needed.

But not everyone has stomach upset with the alpha lipoic. You'll just have to wait and see. Don't tell him, or the placebo thing will kick in and he may over respond, etc. If you have to take with food, you might have to buy extra methyl B12 and take separately.