Also on sale today for $13.95 (reg 19.95) is Seven Minerals magnesium oil. This may be able to relieve muscle soreness, pain, tightness, and stiffness to some extent when applied to the skin. While you can orally consume magnesium, I think applying it topically is much more effective for muscle issues – as someone with constantly flaring muscle tightness issues, I ALWAYS have this at home!
It is also supposed to help with insomnia: one way to try this is to apply this liberally before bedtime, massage it in and it seep in a bit, and take a shower OR soak in a bath with Epsom salts to supply even more magnesium.
Note that this stings quite a bit, so always better to apply it before a bath/shower/ not after.