l carnitine fumarate or tartrate L-Carnitine L-Tartrate Capsules L-Carnitine Fumarate – Olympian Labs
Description
Scientists looking at L-carnitines effects on thyroid health suggested that carnitine was a peripheral antagonist of thyroid hormone activity in some tissues (meaning L-carnitine might prevent the entry of T3 and T4 into cells)

[Revised in March 2016] [Accessed on 6th October 2022]

That, in turn, can increase the chances of pregnancy

: The effects of L-carnitine supplementation on indicators of inflammation and oxidative stress: a systematic review and meta-analysis of randomized controlled trials Hadis Fathizadeh et al

Determination of L-carnitine in serum/plasma and analysis of acylcarnitines in a dried blood spot may be useful in ASD diagnosis and treatment
