pine bark extract with l carnitine Basix L-Carnitine 3500 Liquid & Green Tea – Extreme Nutritions L-Arginine + Pine Bark Capsules,

PMID 3549275

The mobile phase consisted of acetonitrile and 10 mM ammonium acetate with 0.2% formic acid in the water, and was applied using a gradient elution as follows: 0 min90% ACN, 6 min80% ACN, 7.3 min35% ACN, 8 min35% ACN, 8.3 min90% ACN, and 10 min90% ACN

If heart failure is a concern, I especially recommend taking L-Carnitine with other nutrients that support the heart, including CoQ10 (100-150 mg daily), magnesium (400-800 mg daily), and D-ribose (5 grams twice daily)

The great majority of the HRV spectral activity is under the low-frequency (dark gray) region suggesting primarily sympathetic activity

pmid:27196316 42

Vitetta L, Gobe G